| Re: [GMCnet] Generator Light [message #336477 is a reply to message #336476] |
Wed, 29 August 2018 06:55   |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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Bruce Hart wrote on Wed, 29 August 2018 06:15Emory, it happened with both alternators.
Will check the fuse next,
Ken, checked voltage at center post of isolator. Will follow up with
connector.
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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OK, so you are about 1 volt over expected. That point should be around 14.7 volts give or take a few 1/10s of a volt. The other two terminals on the isolator should be around 14.0 volts again give or take a few 1/10s.
This is from memory and could be wrong. Thee is a sense lead that is connected to the big terminal on the horn relay. On that same terminal is the fusible link connected to the isolator. The wire you want is a #12 red one that goes to the alternator pin #2. Along it's route it changes colors from red to white. I would be reading the voltage at the horn relay and also at the #2 terminal at the alternator. They should be the same reading and around 14.0 volts with the engine running.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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