Exciter Wire on CJ7 Alternator - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 08-12-2008, 02:56 PM   #1 (permalink)
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Exciter Wire on CJ7 Alternator

1986 Jeep Cj7 with I-6 258 and Delco style alternator. I am getting a slight continuity reading on my Fluke meter between the Alternator exciter wire and the ground. (The 18ga. brown wire coming out of the top of the ALT).

- Is this a sign that the internal voltage regulator on the ALT is going bad?
- The exciter wire goes from the ALT back into the ignition wiring circuit. What is the exciter wire actual for?
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Old 08-13-2008, 10:08 AM   #2 (permalink)
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I have been told that I DO need the exciter wire in the circuit. Although if anyone has any specific info on the exciter wire I would be interested in hearing your thoughts.
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Old 08-13-2008, 12:05 PM   #3 (permalink)
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When you start your rig the exciter wire is energized and starts the charging circuit on the regulator, if you do not have it, your alternator will never charge. Think of it like an "on" switch. Aftermarket companies do make one wire self exciting alternators for GM applications that do eliminate the exciter wire though.
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Old 08-13-2008, 03:09 PM   #4 (permalink)
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Thanks Wilson, that makes sense to me. I understand why it is wired back into the harness the way it is.
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