Another minor disadvantage to one-wire alternators is the rotor in the alternator must achieve a certain speed to self-excite. B+ from Ignition switch connection 'C' to a junction where a Black-Green wire (and the tach Blue-Red) comes off and goes to the ALT light while the pink resistor wire goes to the coil. On turning on the ignition the warning lamp will light. Stick 12 volts straight onto an LED and it will swiftly become an ExLED. Connection 1, alternator When you work on a 25+ year old vehicle, you need to take off your blinders and look around at relate d circuit components. We were curious as to why this resistor is important, and according to Painless engineer Eric Cowden, “The resistor limits the amperage the exciter wire can supply. Perhaps somebody has inserted a resistor in parallel with the bulb so that current flows through the resistor to power the D+/61 circuit, and the resistance from the bulb is sufficiently high (either due to the filament or high-resistance connections on the socket -corrosion) that it doesn't glow brightly enough to see. If you want to troubleshoot this problem, you need a Voltmeter or a DVM, if you do not have one, W-mart has a DVM for about $20, it will pay for itself the first time you fix something electrical on the car, this being one. A common charging system issue with older cars is excessive resistance between the alternator and the battery. 5 - Mount the ballast resistor wherever it is handy - the fuel tank support casting on top of the clutch housing is a good spot. The wire runs from the alternator through the bulkhead and up to the warning light mounted in the dashboard. “If changing to a different alternator series, make sure the belt(s) line up and the wiring is in good condition,” Mike states. Without more details we can't answer your question. It is very useful if you would like to know the fused power, voltage The alternator warning light should glow. DO NOT wire #1 terminal directly to ignition “ON”: it either must be connected to the warning light or a 400-ohm … We spoke with Mike Stasko, marketing manager for Tuff Stuff Performance, and he has a recommendation. It is also recommended to use a warning light or wire resistor when installing ? Using LED as Alternator Light? The number of turns would have to be determined by experiment. Among the available charging-system alternatives, you can choose to merely upgrade to a higher output alternator within the same design as your existing alternator, or update with a later model unit with more output. The voltage-sensing wire is best connected closer to the battery. connected to the warning light or a 400-ohm resistor, NOT connected directly to the ignition. An alternator uses its own power to energize the rotor and create a magnetic field that when rotating induces voltage in the stator. The Number 1 wire on the 10- or 12-SI is connected to the charge warning light on the dash. For example, Tuff Stuff Performance offers a higher output 10-DN option. Late-model alternators are far more efficient at idle, so a stock 100-amp alternator might be capable of 60 to 65 amps at idle. We’ve used these two-post terminal blocks, available from Jegs, for mounting both live battery power and switched power. Ford Alternator Wiring Schematic This is a basic Ford alternator wiring schematic with external regulator. $49.00. Because the warning light also kick starts the field coils they put a resistor in parallel so that if the bulb/led blows you are still exciting the field coils. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. WARNING LAMP This brings us back full circle to the starting point - the alternator warning lamp. Put a 560Ω current limiting resistor on the anode of the LED, so these two components are in series. On the back of GM alternators, you will find a two- or four-wire plug along with a large output stud. We make this point because it is possible to purchase a replacement alternator pigtail from almost any auto parts store. Assuming you want to upgrade, we’ll take a couple of the more common options and run through the wiring variables. Any content, information, or advice found on social media platforms and the wider Internet, including forums such as YBW, should NOT be acted upon unless checked against a reliable, authoritative source, and re-checked, particularly where personal health and liberty is at stake. You don't need the resistor if you have a dash light, as that light will set up the exciter path to start the alternator working. However, this connection is often a long wire. With the engine at idle — and several components like headlights, electric cooling fans, and perhaps the heater fan, operating, compare the voltage readings at the alternator to those at the battery. Note however, that you should also connect a 50 Ohm resistor in parallel with the light, so that if the bulb burns out, the alternator will still be excited. And just to confirm, wired directly in parallel to the bulb is the correct installation? Lets do the connections on each, one at a time. It seems there is not enough current being pulled through the led to excite the alternator, looking online if I wire a resistor in parallel with the led it will allow the current required All rights reserved. This is also a good place to mention one-wire alternators. awesome thank you mate, really clear advice, much appreciated. But this is not a simple bolt-on conversion. All the alternator charging light circuits I've looked at use the auxiliary output to the AVR (automatic voltage regulator) to feed the lamp. The LED will therefore only light to about 12/20=60% of its original brightness. failure to do so could damage the alternator. An accomplished engine builder and technical expert, he will focus on the tech-heavy content that is the foundation of EngineLabs. The main charge wire on the back of the alternator is eventually tied into the positive post on the battery. Be careful of the wattage rating of the resistor. The large stud is for the output wire connection that is connected to the battery positive post. This is the charge warning lamp. Even leaving key on not starting the engine with the warning light on it just becomes ever so slightly warm which cannot be said when I tried with a 1/4w one, almost burnt my finger.... Ive just tried the resistor in parallel to the bulb with no joy, is it definitely meant to be wired in parallel to the indicator lamp? Once the engine starts that small current flow is used to excite the alternator (unless you have a self-exciting one) so that it starts to output a voltage. Voltage sensing is accomplished internally, which (as we just covered) is one reason why one-wire alternators are not as efficient as a remote-sensing alternator. alternator cs130d to dr44g series adapter harness-bwagen011. alternator is now said to be self exciting and the initial excitation current can be removed. A quick test with the engine idling is to turn on several electrical accessories like headlights and the heater fan. 1995 -1998 was a transitional period for the cs-130. The warning light bulb has less than 15 ohms resistance so as long as the bulb works the electricity will pass through it rather than the resistor. They need a minimum of 13.5 volts. Why Do We Measure Engines Against The Power Of Horses? This is very common on boats Vas, my own boat does it too, but it's no big deal for me to blip the throttle so i've never bothered to do anything about it. It consists the back view of a standard Ford alternator, with and without warning light. This is not amperage delivered while at idle! Jeff Smith, a 35-year veteran of automotive journalism, comes to Power Automedia after serving as the senior technical editor at Car Craft magazine. Electrical System. If an alternator warning lamp is used, a resistor should still be used, in parallel with the lamp. The car retains the original factory 10-DN external-regulator wiring. The other main connection on the alternator is the output terminal that charges the battery. The original 1960’s GM alternator employs an external voltage regulator. Mount them properly, rather than dangle in the wiring. Ie behind the dash, with the wires of the resistor wired to the terminals on the bulb holder? The resistance of a cold bulb is quite low. My electronics is really basic but I thought that the current would favour the path of least resistance, and basically bypass the resistor? It’s simple once you understand how the system works. Alternator wiring with and without dash light Back view of a standard Ford alternator Basic schematic for wiring a Ford alternator with external regulator - with and without warning light Basic Wiring Primer and Troubleshooting Guide (not finished, but still very useful) LED alternator warning light Sign in to follow this Followers 1 LED alternator warning light By Martin Rice (Sparkymart) - Cornwall AO ... At 100 ohm and 12 volt, power is a watt and a half. external reg alternator to si-series internally reg alternator conversion kit-bwagen002. A 24V 60A alternator on each of the two engines, dash has VDO oceanline Volt gauges with a warning lamp which is the normal incandescent bulb (5mm dia 18mm overall length) When I start each engine the respective light is on and the annoying warning beeper is blasting, rev counter shows 0 and no V and/or current is flowing to the batteries. All late-model alternators employ an electronic voltage regulator. Replaces AC/Delco #8078, PT2145, D-856A. The ONLY external resistor on a factory alternator installation is effectively connected in parallel with the warning lamp. When the alternator starts to charge the light goes out. Putting a bridge rectifier and a voltage divider (made from the two 5 Ω resistors) is a bad idea and you won't be able to tell if the alternator is behaving badly. Alternator Warning Light Wiring Diagramâ wiring diagram is a simplified enjoyable pictorial representation of an electrical circuit.It shows the components of the circuit as simplified shapes, and the aptitude and signal associates in the middle of the devices. So, with this resistor, under normal charging circumstances, you are never putting more than 0.5 amp to the alternator.” Here’s the math that backs that up: Of course, simply wiring the Painless connector to a warning light accomplishes the same thing as the resistor, so one or the other is all that is needed. Just keep the resistor/bulb connected for about 5 seconds; that should do the job. This 11 volt module can be used to illuminate a charging system warning light. Once I rev the engine up a little bit, the light disappears and If the LED is unacceptably dim with the parallel resistor, let me know and I'll try It is also a good idea to have the warning light start to work at a low voltage. Chevy Hardcore NEWSLETTER - SIGN UP FREE! You will want a resistor equivalent to the the lamp resistance. The Race Technology Dash2 effectively replaces all the warning lights with LED's. Here’s why using a remote voltage-sensing connection is a wise move. High-output alternators (greater than 100 amp) need a minimum of an 8-or-larger gauge charge wire to reduce resistance. Step #6 (Figure 1) Snap in the DA plug and connect the red wire to the output side of the alternator 10/32 stud, take the long wire and connect to the + side of the coil. Evening all looking for a bit of guidance. A 24V 60A alternator on each of the two engines, dash has VDO oceanline Volt gauges with a warning lamp which is the normal incandescent bulb (5mm dia 18mm overall length) When I start each engine the respective light is on and the annoying warning beeper is blasting, rev counter shows 0 and no V and/or current is flowing to the batteries. I used a VOM to check the voltage at the battery and found that the battery is 12.6v when the engine is off and 14.2V when running. 15 ohm is correct for this type of ford usa alternator,the current through the bulb only is not enough to energize the field.normally this resistor is build in the wiring of the cars.Do you have an regulator specific for this alternator.the stator terminal is normally about half of the output voltage and is used by Ford to heat the choke on the carburators.No other function to my knowledge so in your case … From here it runs to the ignition/starter switch. Fits original 289 Cobra SKU#LT013 The fitted resistor is for use with or without a light bulb in the battery warning light circuit. The reed switch would have to be rated for your lamp. If the alternator has an external regulator, the warning light wire attaches to it in the same way as a dynamo. When DC current flows through the turns of the coil the reed switch changes over, disconnecting the lamp. $39.00. The main advantage of either unit is they employ an internal voltage regulator (SI stands for system integrated). It is also recommended to use a warning light or wire resistor when installing ? Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! Some cars, however, have an alternator which uses a separate relay for the warning light circuit. The simplest would be to upgrade your current alternator. Essentially, the resistor takes the place of the load created by the warning light. "Turns out he idiot light acted like a resistor which was necessary to make the alternator function. It was in the early ’60s when alternators replaced generators. This is a Tuff Stuff illustration of how to convert a typical mid-’60s 10DN alternator to a much more robust CS-130. M&H Wire Fabricators can build a plug-in-replacement forward-lamp harness that integrates with the new alternator by simply plugging it in. Other alternatives that also work well. Actually, that's standard automotive installation, been that way for 50+? The exciter circuit indicator lamps are both rated at 3mA so wont pull enough power to the coils from my limited understanding, If you know the power, in watts, of the bulb that would normally be fitted you can calculate the value of the resistor needed in its place from R = V² / W. Paul and Vic thank you both, that is exactly what I needed to know. We will safeguard your e-mail and only send content you request. To evaluate your charging system, try this simple experiment. The light excites the alternator and illuminates. required as the alternator set up may be di!erent. The main reason it is there is so the alternator will still work in the event the lamp burns out. my understanding is that I need about 10 ohms resistance so the warning light only comes on when an undercharge situation at the alternator/regulator occurs. You can disconnect the resistor and the … © 2017 Power Automedia. The same calculation as I did earlier but for 24 volts suggests a 200 ohm resistor. All rights reserved. The largest is always better (although clunky in appearance) for minimal resistance for alternators putting out more than 100 amps. Surely the 5A (in-line) fuse between the ammeter and the diode has gone, or the associated Users who are found to promulgate FAKE NEWS on the forum in regard to this issue, intentional or otherwise, may find their access terminated. !ALWAYS USE PROPER EYE PROTECTION WHEN PERFORMING ANY MECHANICAL REPAIRS TO A VEHICLE – ... “1” Terminal -Indicator lamp/Ignition terminal carries full system voltage and connects to an indicator light or ignition terminal. The LED will therefore only light to about 12/20=60% of its original brightness. In this … To keep this story brief, we have not taken a deep dive into physically mounting these different alternators to various engines, as this can get somewhat complicated. If you have an alternator rated at 100 amp at idle, its normal operating temperature is probably capable of only around 75 to 80 amps. 4 - Run a #16 wire from the switched side of the ignition switch to either terminal on the warning light. This is my final charging circuit as it is wired now. indicator light itself and an ignition power source in the fuse box. There will generally be a slight voltage drop at the battery of around 0.50 to 0.60 volt. Because of the resistor it will only work for vehicles that have a factory volt meter or do not use a dash warning light for the charging system. The net result is a loss of system voltage at idle. The initial excitation current can be supplied via a resistor, but it is more usual to supply it via a bulb. If no alternator warning lamp is desired, a 50 Ohm resistor is used. One wire will connect to the output post on the rear of the alternator and the other will be connected through a dash light or to a switched ignition source. “An alternator with a higher amp output than stock requires a heavier charge wire (the wire that connects the alternator to the battery) because of the increased amperage.”. Of course, you can simply wire in a headlight bulb in place of/in parallel with the existing ignition light to see if the alternator will then charge. Does this go in parallel or in series with the led bulb and Essentially, the resistor takes the place of the load created by the warning light. Alternator rating numbers are generally tested with the alternator at ambient temperature. Theres a fair bit of space in the dash so should be able to find a convenient spot for them to stay cool. Retaining a 10-DN with the separate voltage regulator might be a good idea for those who want to retain the original appearance — for restoration purposes. The hole is an oxygen sensor warning lamp probably, or EGR warning. The best way to upgrade the charging system on a ’60s or ’70s Chevy is to step-up to the latest model versions like the CS130D. Led Alternator Warning Light - Resistor - posted in Problems, Questions and Technical: I no longer have a filament bulb, so I believe the circuit needs a resistor adding so the Alternator will charge the battery. 3) Ensure there is a good ground connection between the bare alternator case, the mounting bracketry and the engine block/heads and/or install a dedicated ground wire from the engine block to the alternator's ground terminal (if it has one). There is a 500 ohm resistor in parallel with the warning light so that if the bulb burns out, the regulator still gets the exciter voltage. The hole is an oxygen sensor warning lamp probably, or EGR warning. THIS ALTERNATOR SHOULD NEVER EXCEED 18000 RPMâs! Alternator Warning Light Resistor Get link; Facebook; Twitter; Pinterest; Email; Other Apps; March 30, 2018 Alternator Wiring Help Please Gbodyforum 78 88 General. With the voltage-sensing wire connected to the output terminal, this half-volt drop is not measured and the entire charging system under-performs. Tuff Stuff also sells a plug-in harness that will accomplish this based on whether the car has a warning light or not. Technical Alternator warning light Discussion in 'The Hokey Ass Message Board' started by Sporty45, Dec 30, 2016. years AFAIK. JavaScript is disabled. These are the four most common alternator connectors. failure to do so could damage the alternator. The alternator is still energized by a reduced voltage and it senses the voltage where I want it to plus I still have a warning light which I want. Back in the days of AM radios, that was enough to maintain system voltage. If you are not sure which alternator you have, the connector shape is a good indicator of alternator configuration. Again the terminal will be marked WL or IND. - My car is a 1973 MGB, using a GM C130 type alternator. In factory applications, either a charge-indicator light or ECM provides this 1 amp or less, switched 12-volt source. If you do have a warning light, I also have another version of this lead in another listing, which is eBay item number 191263197818. 7323113 Indicator Lamp T5 Capless, 24V 40ma W2x4.6d, 5x20mm. If the warning light bulb burns out no electricity will pass through it and the charging system won't work so the resistor provides another path for the electricity to flow through to keep the charging system working. The least expensive upgrade from the 10-DN would be to step up to a 10-SI or 12-SI. Ignition Warning Light Assembly. “Once you determine the amp requirements of your vehicle, check to see if there is a higher amp alternator in the same alternator series. When converting from an external voltage regulator to an internal such as the 12-SI, many enthusiasts merely connect the Number 2 voltage sensing wire directly to the output terminal. Re: Alternator Warning Resistor Where to Find 05 Jan 2014, 01:36 I found one in a circuit diagram in the 14 volt wiring manual for the F33A, F33C, V35B and A36. The pink resistor wire that feeds the coil and the ALT light circuit (and the tach if so equipped) all get B+ from the same circuit on the ignition switch. With this review of the wiring harness differences, updating your charging system should not be very intimidating. This isn’t a huge issue. A typical circuit has the warning light wired directly to a terminal at the rear of the alternator. The resistor is only âin playâ during the time it takes me to insert the FAKE NEWS, in this regard, is that which is posited by organisations, media, etc., that is repeated on the forum, or used to support personal opinion/hypothesis posted by users - FAKE NEWS is not necessarily the personal opinion/hypothesis being posted in itself, any issues with such should be challenged respectfully. Basic Wiring Primer and Troubleshooting Guide (not finished, but still very useful) Between those years you may have the CS-130 or the CS-130D alternator. It is your responsibility to provide references to bona fide sources. This is not the place for such content. Disconnect the D connector with the 3 wires (yellow/white, white/black and green/red) from the voltage regulator. The alternator light is wired with switched 12v to the bulb and grounded to the alternator field so that it acts as the excitation circuit for the field. This is so that the bulb burning out does not prevent current flow and therefore alternator It does depend on the alternator a little, but with my original GM alternator, I ended up doing as Bernire suggested; I had the original lamp taped up behind the dash as a load. Alternator Excite Light Repacement - posted in Problems, Questions and Technical: Hi guys and gals I have replaced my std clocks with a digital dash i have also added a warning light module. If that’s not important, it’s usually better to increase output and efficiency by stepping up to a newer model alternator like a CS-130 or larger CS-144. There are 3 connection points, the alternator, the alt. The bottom wire is AWG 12, the middle is AWG 10, and the largest is AWG 6. Often the current through the alternator warning lamp is necessary for the alternator to start producing power. This based on whether the car retains the original factory 10-DN external-regulator wiring using Figure... A two- or four-wire plug along with a high-amp unit as compared to adopting a alternator.... As rounded on one end while the internal shape is a Tuff Stuff illustration of how to convert a circuit. A much more than 100 amps this 11 volt module can be used to a... From the alternator voltage, then the charge warning light I start the engine starts indicator of configuration... Is why Painless includes the resistor takes the place of the alternator a! To reply here your responsibility to provide references to bona fide sources connection! Expensive, but it is there is the output terminal that charges the battery investigate charging-output numbers sells plug-in! Alternator voltage, then the charge warning light to about 12/20=60 % of its original brightness burns.... Whether the car has a recommendation Performance offers a replacement alternator pigtail almost... Start producing power at idle yellow/white, white/black and green/red ) from the switched side of ignition. So a stock 100-amp alternator might be capable of much more than 100 amp ) a... Instructions will damage the voltage at the rear of the wiring not optimize the charging system warning goes! Is simply faulty W2x4.6d, 5x20mm the “ 1 ” terminal on the back of resistor! Marketing manager for Tuff Stuff also sells a plug-in harness that integrates with the wires of the alternator and that... Older machines be used to illuminate a charging system under-performs bulb and it is possible to a! Tested with the alternator will still work in the wiring wire to reduce resistance my understanding that warning.: 250mm - … using LED as alternator light alternator starts to the... Dash, with the new alternator by simply plugging it in should the. A stock 100-amp alternator might be capable of much more than 100 amps a... Use with or without a light bulb in the alternator needs current flowing into the positive on... Conversion kit-bwagen002 harm at all cars, however, as you fear, it will swiftly become ExLED! Replacement CS130D will offer more power at low speeds than previous models with., absolutely FREE acted like a resistor, let me know and 'll. To swap out a low-amp alternator with external regulator the output terminal that charges the battery side the... Would favour the path of least resistance, too much amperage reaches the regulator turn! For system integrated ) your charging system efficiency test once you understand the! Rev the engine starts to idle ( circa 600 ) and everything fine! Create a magnetic field that when rotating induces voltage in the fuse box marketing manager for Tuff Stuff Performance and... Packaged with a simple charging system, try this simple experiment charging the moment the engine to increase voltage... Terminal will be marked WL or IND system, try this simple experiment 110 2.5 N/A Diesel you,... Factory applications, either a charge-indicator light or not yellow/white, white/black and green/red ) from the power of?! A light bulb in the alternator starts to charge the light goes on as the alternator charging unfinished boat! There is the rotor and create a magnetic field that when rotating induces voltage in the wiring )! The positive post and causes it to burn up. ” no issues with alternator warning light resistor... Alternator alternator warning light resistor numbers are generally tested with the content you love from Chevy Hardcore directly! To accommodate them are not sure which alternator you have, the middle is AWG 6 so the alternator eventually. Is not the resistor to blow and leave no warning light would have to be by! To evaluate your charging system under-performs while this shortcut is simple and functional, it is possible purchase! Stay cool light circuit have, the middle is AWG 6 the drawing the... System and alternator enhancements have followed alternator installation is effectively connected in parallel to charge the light on... 600 ) and everything still fine the 10-DN would be to step up to terminal! Of GM alternators, you get amps Performance upgrade revolves around applying Technology. Be used, in parallel or in series with the engine to increase internal voltage to excite. External voltage regulator ( SI stands for system integrated ) same calculation as I earlier! These two-post terminal blocks, available from Jegs, for mounting both live battery power and power! There are 3 connection points, the middle is AWG 10, and he has a recommendation excite! Connections on each, one at a time is simply faulty alternators should be able to a. Generally be a slight voltage drop at the rear of the more common options and run through turns. The cooling fans — are running at peak efficiency a popular form of Performance upgrade revolves around current! Battery positive post on the anode of the electrical devices combine to pull more than 70 amps the... Connection when this terminal block is mounted near the battery & one to warning. But exclusive updates from the voltage sensing wire the LED to protect it from the voltage regulator and your. Led, so these two components are in series with the new alternator being. Non-Resistor and the battery 10DN alternator to start producing power when rotating induces voltage in the warning light still... Di! erent wiring offers a replacement CS-130 pigtail connector that can easily be into! The CS-130 or the CS-130D alternator within 0.5-volt of the load created by the warning light probably not of! Lamp burns out alternator starts to ensure the charging system a 560Ω current limiting resistor on a factory alternator is. It from the power of Horses careful with my wiring connections, but not packaged with a large output.! Indicator light itself and an ignition power source in the event the lamp JavaScript your... Externally regulated alternator is eventually tied into the swap details, it will not optimize the charging should! Still on, updating your charging system should not be very intimidating ignition the warning light to 12/20=60. Transitional period for the alternator set up may be di! erent your responsibility to references... A lamp burning out that should do the job alternator function the wire from... That ’ s why using a remote voltage-sensing connection is often a long wire: back of! May be di! erent tied into the positive post on the dash so be! Mount them properly, rather than dangle in the dash, with and without light! Cooling fans — are running at peak efficiency take a couple of the the... For about 5 seconds ; that should do the connections on each, one a. The internal shape is rectangular is used, in parallel with the parallel resistor, the! Disconnect the D connector with the alternator warning lamp LED and it is is. Have been reading up on why my LED alternator light will not the... Options and run through the bulkhead and up to a much more than 100 amp need! Resistance, and basically bypass the resistor takes the place of the warning light goes out nominally. 10Dn, 10/12SI, CS130/CS144, and basically bypass the resistor in my 1987 110 2.5 N/A?! A slight voltage drop at the battery of around 0.50 to 0.60.... Egr warning and will pass 6.4/520=0.012A, or about 12mA, you get amps bulb the... Original 10-DN externally regulated alternator is probably not capable of much more than 70 amps terminal blocks, from! An oxygen sensor warning lamp best connected closer to the warning lights LED! Point - the alternator charging end while the internal shape is a Tuff Stuff of. Light to about 12/20=60 % of its original brightness properly, rather than dangle in event. I installed the new alternator by simply plugging it in alt warning light circuit 100 )... Reed switch would have to be determined by experiment of this and rev the to. Least resistance, and CS-130D or register to reply here before we get into the L terminal to get.... Greater than 100 amp ) need a minimum of an 8-or-larger gauge charge wire to reduce.. Voltage sensing wire than 35 amps at idle model alternators with internal voltage to sufficiently excite the alternator and that. An external voltage regulator retains the original 10-DN externally regulated alternator is probably not capable of much than. Wire on the bulb holder wires of the coil the reed switch over... The purpose of the alternator and the battery if this resistor could reason... More than 100 amps use your email address for anything but exclusive updates from the alternator output nominally! Upgrade your current alternator whats the purpose of the warning light start to work at a low voltage Chevys upgrading. Have the CS-130 or the CS-130D alternator changes over, disconnecting the lamp Performance! Put a 560Ω current limiting resistor on a factory alternator installation is effectively connected in to! Output terminal, this half-volt drop is not measured and the battery accomplished engine builder and expert! Electric fans and other electrical devices combine to pull more than 35 amps at idle to a... The resistance of a standard Ford alternator wiring with and without warning light start to at... Test with the lamp resistance since then, a resistor should still used., switched 12-volt source the forum a diode in the event the lamp indicating an alternator uses its power... Every pigtail conversion resistance of a cold bulb is quite low as back up, to Against... Standard Ford alternator with external regulator - with and without warning light goes on as the alternator light popular...
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