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Old 09-14-2009, 06:32 PM
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ACDelco Alternator wiring?

This may seem like an elemenatry question to a lot of you but.... I have a 1969 Firebird that I am rebuilding. The wiring was 40 yrs old and had been butchered no less then 10 times. Enter new Painless wiring harness. That went rather smoothly. Car had a blown up engine, Enter new GM ZZ4 crate motor. Here is the meat of the question. The alternator that came with the motor has 4 wires in its plug. All of which are plain white. The new harness only had the exciter wire. I need help with what's what.

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Old 09-14-2009, 07:39 PM
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First off get a new or rebuilt alternator that has the traditional plug. The Painless harness has only the exciter wire because that is all you need. You should have also had a heavy red wire separately from the harness that is for the alternator charge wire that goes on the big lug at the back of the alternator. It then goes to your battery positive or to a common point which will also power your fuse panel. See this article

Vince
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Old 09-14-2009, 07:52 PM
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The alternator is brand new from GM. It 's 80 amp and already set up for the pulley system for the front end. I hate to go spend the $$$ on another just because the wires don't make sence to me. Admittedly I'm no professional by any stretch of the imagination.
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Old 09-14-2009, 08:00 PM
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Can you post a pic of the alternator, I have never seen a GM alternator with a 4 wire plug?

Vince
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Old 09-14-2009, 08:09 PM
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I'm new here let me see if i can figure out how. hold on
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Old 09-14-2009, 08:17 PM
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OK I give how do i post a picture?
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Old 09-14-2009, 08:34 PM
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I can't get the picture to post. It's a shame my 69 Bird could be a twin to your Camaro. Same year, color and stripes. When I figure it out I'll start a project album.
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Old 09-14-2009, 08:59 PM
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Quote:
Originally Posted by Zagfan
OK I give how do i post a picture?
Here is an old post in which I explained how to do this, step-by-step.
I hope you find it useful.

Click Here
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Old 09-15-2009, 12:04 AM
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The Painless harness and diagram assumes that you are running an internally regulated alternator, which most people do. It could be that your alternator requires an external voltage regulator. That's the way it would have been from the factory in '69.

If so, it should be wired as follows:



The only 4 wire internally regulated Delco alternators I know of were used in diesel engine applications - the fourth wire was a tach signal.

Hope this helps...
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Old 09-15-2009, 08:56 AM
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I think Joe may be right, if it were my application I would not use an externally regulated alternator...just me.

Vince
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Old 09-15-2009, 06:24 PM
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I sounds like you have a newer GM alternators, like the CS130, which use a four wire plug. You don't really use all four wires, but the plug has four positions. All you really need is a constant 12 volts on one wire, and a switched 12 volts with resistance (like an idiot light) on the other terminal.

Take a look at this link for additional info on wiring alternators, especially the explanation from 6/12/07 at 9:29 PM.
http://www.binderplanet.com/forums/s...ighlight=cs130

Bruce
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Old 09-15-2009, 08:03 PM
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If you have a CS130 alternator here is the wiring diagram from the Painless Performance web site.

Vince
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