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Old 03-07-2019, 10:25 AM   #1 (permalink)
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Chevy Alternator Wiring (Non-Chevy vehicle)

I am helping a friend on a project, and it entails using a high output chevy alternator on a mercedes TD engine. I am having a hard time finding which wire to hook up to an ignition source for the "sense" wire, or alternator turn on wire. Can anyone help?

This is the alternator being used:





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Old 03-07-2019, 04:27 PM   #2 (permalink)
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I think it's "L"
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Old 03-08-2019, 05:16 AM   #3 (permalink)
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thanks! but do you know if it goes straight to a 12v IGN source? or do I have to have a resistor in line or something? I found some more info that said you have to have resistors on some wires, but that some newer alternators you dont....so much information out there, i just want to make sure I do it right...
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Old 03-08-2019, 05:53 AM   #4 (permalink)
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It's been a while..... but the L goes to a lamp or resistor then to a positive. While the alt is not charging, the L on the alt is ground so the lamp is on. When its charging its + and the light goes off.
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Old 03-08-2019, 08:04 AM   #5 (permalink)
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In the pict above, the yellow wire goes thru a resistor (anything from 85-300 ohms 1 watt) to ignition. No other wires are used. We have done a thousand + of these over the years like this. Steve
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Old 03-09-2019, 12:12 PM   #6 (permalink)
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Thanks, I appreciate all the info!!
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Old 03-09-2019, 06:32 PM   #7 (permalink)
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one more question....I found another thread on here that mentioned the "P" wire can be used as an RPM signal to run a tachometer? Is this true? How does this work? Are there any limitations on the type of tach that can be used? The build I am working on is using all aftermarket brand new VDO gauges. How does the alternator P wire know what RPM the engine is turning at? Would this have to be calibrated somehow?
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Old 03-10-2019, 11:06 AM   #8 (permalink)
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Quote:
Originally Posted by yitzac1990 View Post
one more question....I found another thread on here that mentioned the "P" wire can be used as an RPM signal to run a tachometer? Is this true? How does this work? Are there any limitations on the type of tach that can be used? The build I am working on is using all aftermarket brand new VDO gauges. How does the alternator P wire know what RPM the engine is turning at? Would this have to be calibrated somehow?
If its putting out a signal, it will be the alternator RPM with x pulses per revolution.
You would need to use a tach that can be adjusted to calibrate it (ie: use a laser tach on the crankshaft and adjust the dash tach to match), or use something like the Dakota Digital offerings to adapt the number of pulses per RPM to match what the tach is looking for: Tachometer Calibration & Interfaces

Aaron Z
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Old 03-11-2019, 06:13 AM   #9 (permalink)
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thanks very much!
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Old 03-11-2019, 09:31 AM   #10 (permalink)
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look into the alt connector to see if all the pins are populated (some are not). If it has a pin, you can use it for a tach output. That pin is connected to one of the ac phases before the diodes. this setup is common on diesels with no electronics. Steve

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Old 03-12-2019, 12:43 PM   #11 (permalink)
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i double checked and yes all the pins are populated.

One last question (hopefully). The voltage gauge we are using in the vehicle does have an integrated warning lamp, so im sure we will want to make use of that. Chances are this is an LED lamp in the gauge (brand new VDO multi gauge). would that LED have enough resistance to be able to run the L wire straight to it? or would I need to still add a resistor in line? Also with it (most likely) being an LED, would the positive voltage from the alternator, during charging, do any damage connected to the negative side of the LED?
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