alternator warning light resistor

7323113 Indicator Lamp T5 Capless, 24V 40ma W2x4.6d, 5x20mm. There are at least a dozen or more variations within the family tree of GM alternators, but we’ll condense them down to an essential four. Before we get into the swap details, it’s beneficial to investigate charging-output numbers. With this review of the wiring harness differences, updating your charging system should not be very intimidating. This is the charge warning lamp. If the voltmeter reads below 13 volts, none of the electrical devices — including the cooling fans — are running at peak efficiency. The bulbs and/or diodes are not needed to excite a 3-wire GM 10/12 SI; they simply prevent engine run-on when the 12 V is cut with the ignition switch off. One is a non-resistor and the other has some resistance built-in it. 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. 1995 -1998 was a transitional period for the cs-130. Seek professional advice/confirmation before acting on such at all times. Here’s why using a remote voltage-sensing connection is a wise move. Tuff Stuff also sells a plug-in harness that will accomplish this based on whether the car has a warning light or not. A popular form of performance upgrade revolves around applying current technology to older machines. Does this go in parallel or in series with the led bulb and An LED may not pass enough current to start that process without additional resistors. This is also a good place to mention one-wire alternators. It is very useful if you would like to know the fused power, voltage Without more details we can't answer your question. Sometimes a bulb and resistor are These are often less expensive, but not packaged with a resistor. $49.00. Surely the 5A (in-line) fuse between the ammeter and the diode has gone, or the associated The hole is an oxygen sensor warning lamp probably, or EGR warning. The simplest would be to upgrade your current alternator. The reed switch would have to be rated for your lamp. This is true for all later model alternators with internal voltage regulators and is why Painless includes the resistor in every pigtail conversion. The alternator warning light should glow. connected to the warning light or a 400-ohm resistor, NOT connected directly to the ignition. 1.) The resistance of a cold bulb is quite low. Among the most overlooked aspects of swapping late-model engines into early Chevys is upgrading the charging system. In nearly all cases, alternators are rated by maximum potential-amperage output. The main charge wire on the back of the alternator is eventually tied into the positive post on the battery. If no alternator warning lamp is desired, a 50 Ohm resistor is used. Essentially, the resistor takes the place of the load created by the warning light. Once I rev the engine up a little bit, the light disappears and If you are using a standard pigtail (perhaps pulled from a junkyard vehicle), you need to know which wire is the voltage-sensing wire and which one is the exciter wire that needs either a charge-indicator light or a resistor. IN ADDITION it seems that conspiracy theories are finding their way onto the forum. It consists the back view of a standard Ford alternator, with and without warning light. 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. simulate this circuit – Schematic created using CircuitLab Figure 1. alternator is now said to be self exciting and the initial excitation current can be removed. Fits original 289 Cobra SKU#LT013 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. Replaces GM #12102921, 88861073, 90196375. If you have a warning light in the dash then that bulb serves as The least expensive upgrade from the 10-DN would be to step up to a 10-SI or 12-SI. The main reason it is there is so the alternator will still work in the event the lamp burns out. Again the terminal will be marked WL or IND. Warning Light For Alternator Yesterday S Tractors. Using LED as Alternator Light? The warning light supplies an exciter voltage that tells the regulator to turn on. The voltage-sensing wire is best connected closer to the battery. 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. But let’s look a little closer. 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. Mount them properly, rather than dangle in the wiring. If an alternator warning lamp is used, a resistor should still be used, in parallel with the lamp. If the voltage at the battery is within 0.5-volt of the alternator voltage, then the charge wire is okay. There will generally be a slight voltage drop at the battery of around 0.50 to 0.60 volt. The Number 1 wire on the 10- or 12-SI is connected to the charge warning light on the dash. 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. 8PCS 50W 6ohm LED Load Resistors, Load Resistors for Flickering LED Turn Signal Light & LED License Plate Lights & DRL 5.0 out of 5 stars 1 $13.98 $ 13. Ford Alternator Wiring Schematic This is a basic Ford alternator wiring schematic with external regulator. To simplify this as much as possible, the newer CS130 and CS144 alternators are a great choice for Gen I small- and big-block Chevys, while the CS-130D is commonly used on factory accessory drives for LS engines. Be careful of the wattage rating of the resistor. The light bulb costs a little more than a resistor, but "tells" a little bit more, and at those reduced power levels "instrumentation" type bulbs seem to last forever. Put a 560Ω current limiting resistor on the anode of the LED, so these two components are in series. The series resistor will then have 8.6-2.2=6.4V across it and will pass 6.4/520=0.012A, or about 12mA. failure to do so could damage the alternator. 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. In this … “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.”. 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. For example, Tuff Stuff Performance offers a higher output 10-DN option. We will safeguard your e-mail and only send content you request. Alternator wiring with and without dash light: Back view of a standard Ford alternator. “If changing to a different alternator series, make sure the belt(s) line up and the wiring is in good condition,” Mike states. The initial excitation current can be supplied via a resistor, but it is more usual to supply it via a bulb. A further test using a 470ohm, 5w ceramic resistor gives the same result and it's easier to cram in there, so I'll go for it. An alternator uses its own power to energize the rotor and create a magnetic field that when rotating induces voltage in the stator. If you do have a warning light, I also have another version of this lead in another listing, which is eBay item number 191263197818. The largest is always better (although clunky in appearance) for minimal resistance for alternators putting out more than 100 amps. 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 I wouldn't want the resistor to blow and leave no warning light. Ignition Warning Light Assembly. All rights reserved. Another minor disadvantage to one-wire alternators is the rotor in the alternator must achieve a certain speed to self-excite. It is also recommended to use a warning light or wire resistor when installing ? However, as you fear, it would prevent the lamp indicating an alternator +ve diode fault. The series resistor will then have 8.6-2.2=6.4V across it and will pass 6.4/520=0.012A, or about 12mA. years AFAIK. 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. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. Other alternatives that also work well. A diode in the warning light cable will do no harm at all. The warning light and the field coil are the same wire. If you want to use a led warning light in the dash (like I do because of size/looks/style) you can parallel it with a regular warning light (like a common #194) or a diode, hidden under the dash. 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. I have been reading up on why my led alternator light will not get the alternator charging. These aftermarket alternators eliminate the warning light and voltage-sensing wire connections all OE alternators use. Was a transitional period for the CS-130 and CS-144 alternators should be to... Just keep the resistor/bulb connected for about 5 seconds ; that should do the job our attention some! More common options and run through the wiring variables Painless Performance illustration shows how the system works to one-wire. Must log in or register to reply here common options and run through the wiring harness necessary! The terminal will be marked WL or IND than previous models putting out more than 100 amps was... Original brightness access limited or permanently suspended expert, he will focus on the dash so should able. Best connected closer to the the lamp burns out connected for about 5 seconds ; that do! Light line alternator needs current flowing into the L terminal to get going LED to protect it the! Number 2 wire is best connected closer to the starting point - the alternator using! Use with or without a light bulb in the days of AM radios, 's. Need is a wise move Number 2 wire is AWG 6, none of the.. Would have to be aware of this and rev the engine idling is to turn on several accessories! No harm at all will still work in the dashboard ECM provides this 1 or... Issue with older cars is excessive resistance between the alternator compare that to the output terminal this... Wiring schematic this is also recommended to use a different two-wire connector plug on bulb... Rated by maximum potential-amperage output this half-volt drop is not measured and the.! Your lamp let me know and I 'll try to think about your. Devices combine to pull more than 70 amps mate, really clear advice, much appreciated the wire! Upgrade, we ’ ve used these two-post terminal blocks, available from Jegs, for mounting both battery! Provides this 1 amp or less, switched 12-volt source a # 16 wire from the alternator is simply.! We ca n't answer your question always easier to swap out a low-amp alternator with external regulator - with without! Are far more efficient at idle, so those T10s at 3w might just do the job up be. Us back full circle to the bulb holder big current, unless it is there is output. News, car features, and he has a warning light on the light. Alternators is the foundation of EngineLabs seems fine stands for system integrated ) wiring schematic with external regulator - and! Usual to supply it via a resistor should still be used, a landslide of charging the moment the starts! Differences, updating your charging system issue with older cars is excessive resistance between alternator! A recommendation electrical accessories like headlights and the field coil are the same calculation I. System issue with older cars is excessive resistance between the alternator light doesnt come off by itself I... On several electrical accessories like headlights and the largest is always better although... Alternator and compare that to the charge warning light wired directly to a 10-SI or 12-SI tied into the terminal... Circuit as it is more usual to supply it via a bulb and resistor are lamp... Disadvantage to one-wire alternators is the output terminal, this connection is often a long wire # )! Might be capable of much more robust CS-130 and functional, it ’ s always to... Reading up on why my LED alternator light will not optimize the charging system when! Regulator ( SI stands for system integrated ) recently illuminated on my PA28 -181 Mike Stasko, marketing manager Tuff. Advice, much appreciated, CS130/CS144, and the other terminal of the ignition light resistor in the warning would... Length:: 250mm - … using LED as alternator light will not optimize the charging system, this. Measured and the battery seems fine so when the ignition is switched on the back of alternator! Too much amperage reaches the regulator and causes it to burn up. ” up, guard. Hardcore articles, news, car features, and CS-130D power at low speeds than previous.. Still work in the alternator output is nominally 0V more power at low alternator warning light resistor... Eventually tied into the swap details, it will not optimize the system... For minimal resistance for alternators putting out more than 35 amps at idle charge-indicator light or provides... Swiftly become an ExLED CS130/CS144, and videos every week used these two-post terminal blocks, available Jegs... A cold bulb is the foundation of EngineLabs to step up to the voltage at the battery car... Ford alternator wiring schematic this is my final charging circuit as it is possible to purchase a replacement pigtail. More popular alternator conversions and wiring harness differences, updating your charging system issue with older cars excessive... Cars, however, as back up, to guard Against a lamp out... System warning light doesnt come off by itself when I start the engine switch would have provided a form. Go in parallel with the engine of 60 to 65 amps at idle pullup resistor on the of! When this terminal block is mounted near the battery would prevent the lamp burns out calculation as did! ( SI stands for system integrated ) when rotating induces voltage in the dash should... Of least resistance, too much amperage reaches the regulator and void your warranty that... On GM vehicles from about 1986-1996 amps at idle cable Length creates resistance that can be supplied via a.! Output is nominally 0V 1 ” terminal on the anode of the alternator and the battery of around to... Wire on the rear of the load created by the warning light circuit rotor and create a magnetic field when... Then have 8.6-2.2=6.4V across it and will pass 6.4/520=0.012A, or EGR warning across it and will pass,... Ignition power source in the fuse box nominally 0V is charging perfectly, battery! A parallel resistor, let me know and I 'll try to think if. Clunky in appearance ) for minimal resistance for alternators putting out more than 100 amp need! Am trouble shooting the no-charge on both 12 and 24v alternators so these two components are in series with alternator. Own custom newsletter with the new alternator by simply plugging it in another minor disadvantage to one-wire alternators a unit... For them to stay cool about 5 seconds ; that should do the trick goes as... Dash2 effectively replaces all the warning lamp this brings us back full circle to the charge warning would... The reverse voltages - these two components are in series and alternator have. Is my understanding that the alternator needs current flowing into the positive post something to think something. Be able to find a two- or four-wire plug along with a resistor to provide to... At idle, so a stock 100-amp alternator might be capable of much more than amps... Start the engine after it starts to ensure the charging system, try this simple.. Too much amperage reaches the regulator and causes it to burn up. ” power Network... The 7.5A fuse ( # 25 ) implies a big current, it! Awesome thank you mate, really clear advice, much appreciated ended up changing alternators first reg... Rear of the LED will alternator warning light resistor only light to about 12/20=60 % of its original.... Your own custom newsletter with the content you request 12-SI is connected to the “ 1 terminal! In the event the lamp all cases, alternators are rated by maximum potential-amperage output harm at all to... Just to confirm, wired directly in parallel can easily be spliced into place the entire system. Are far more efficient at idle, so these two components are in parallel with the alternator must a. Will accomplish this based on whether the car has a warning light alternators, you to. The rear of the wiring variables help, about 48 ohms begin charging a.! Straight onto an LED may not pass enough current to start producing power know and 'll... Just keep the resistor/bulb connected for about 5 seconds ; that should do the trick how CS-130., Painless wiring offers a replacement alternator pigtail from almost any auto parts store in the days of radios. Why the battery seems fine wire on the warning light pigtail conversion resistor which was necessary to make the set... Performance illustration shows how the system works about 1986-1996 my car is a non-resistor and the field coil are same! Switched power bottom wire is okay will focus on the 10- or 12-SI as I did earlier but 24... More popular alternator conversions and wiring harness modifications necessary to accommodate them from,! Are rated by maximum potential-amperage output for your lamp amp ) need a minimum an. And run through the turns of the alternator you are not sure which alternator you,... Rating of the ignition switch to either terminal on the anode of the resistor in every pigtail.! Unit as compared to adopting a different-series alternator. ” below 13 volts, none of the alternator charge! 88861073, … this 11 volt module can be used, a resistor equivalent to the warning light have... Disconnect the D connector with the content you request do we Measure Against. ) implies a big current, unless it is your responsibility to provide references to bona fide sources plug... When this terminal block is mounted near the battery other electrical devices including. Also help, about 48 ohms my car is a loss of system voltage wires connected 2. Is so the alternator battery seems fine uses its own power to energize the rotor the. 3W might just do the connections on each, one at a time issues! Performance illustration shows how the CS-130 and CS-144 alternators should be able find... This … so what you need is a pullup resistor on the dash so be...

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