Alternator Electrical Hook ups -
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Unread 09-04-2011, 09:09 PM   #1
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1989 YJ Wrangler 
Join Date: Jun 2010
Location: Alabama
Posts: 8
Alternator Electrical Hook ups

I am replacing the wiring in my Jeep Wrangler Laredao(4.2L) using a painless wiring kit. The wiring for the Ignition is giving me problems. Does anyone have experience with this? Should the exciter have power even when the key is off?

BamaCrawler is offline   Reply With Quote
Unread 09-04-2011, 09:54 PM   #2
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Join Date: Aug 2011
Location: Albany, Ga
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I just replaced my wiring and ECU in a 1991 with the 4.0.

I know in your case the alternator is controlled by either an internal or external voltage regulator. In either case, the exciter should be powered from the ignition. In my case, the ECU controlled the alternator and I used an external voltage regulator from a 1988 dodge truck. Both control circuits were powered from the ignition.
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Unread 09-05-2011, 06:00 AM   #3
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1999 XJ Cherokee 
Join Date: Apr 2011
Location: Ceiba, PR
Posts: 780
No. The exciter is the field, nothing more than a coil of wire. It will drain the battery if left powered. Don't know on this engine if the regulator is on the positive or negative side.

Do a search on this thread. I'm certain this question has been asked.


Jim W
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