Alternator Ground - Team Camaro Tech
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post #1 of 3 (permalink) Old Apr 2nd, 05, 03:37 AM Thread Starter
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Join Date: Mar 2002
Location: Houston, Texas U.S.
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Alternator Ground

The back side of my alternator has a screw stud sticking out on lower side towards the engine. Next to this stud and cast into the alternator are the letters GND. I think I can assume GND stands for Ground but I can't figure what is suppose to attach to this stud. I have all new harnesses and the alternator is original style for a 68 Camaro. I have attached all wires in harness and there are no ground wires to attach. I know I have messed with several alternators in my life, but I do not recall ever disconnecting a ground wire from the alternator. Any help would be appreciated?

EricE
68 Butternut Yellow
SS Coupe 396/325
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post #2 of 3 (permalink) Old Apr 2nd, 05, 05:39 AM
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Join Date: Aug 2000
Location: DULUTH, GA.
Posts: 917
Re: Alternator Ground

Most alternators if not all will ground themselves thru the case that is mounted to the engine mounts thru hard mounts. Some alternator applications actually have hard plastic/hard rubber mounts that electrically isolate the alternator and the only way to ground it is thru the case terminal you have discovered.

You can hook this terminal up with a wire to engine ground if you want, but usually is an overkill. However, I have seen some chrome plated models have problems with gounding needing external grounding. This is because either the chrome "flash" or uneven surfaces don't quite match. This is handy when that happens.

A symptom of poor alternator grounding would be full 14VDC ish voltages at light loads and really dropping off at high loads.

Steve "Jack'stands" Jack

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post #3 of 3 (permalink) Old Apr 2nd, 05, 02:28 PM Thread Starter
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Join Date: Mar 2002
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Re: Alternator Ground

Thanks! Good info!

EricE
68 Butternut Yellow
SS Coupe 396/325
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