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Home » Public Forums » GMCnet » ignition switch on no alt. sense power (no sense 12v at alt. with ignician switch on)
ignition switch on no alt. sense power [message #347691] Wed, 11 September 2019 16:22 Go to previous message
Lhockman is currently offline  Lhockman   United States
Messages: 5
Registered: February 2019
Location: Alamogordo NM
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I have 12v at alt. sense with ignition off, and no power when ignition in on position. This causes the alt. to output high voltage. Has anyone seen this problem or cure?


I am not sure about the brown wire on the exciter/sense wire (I thought it would be a ground (mistake) ) I used it as a ground while checking the voltage at this connector. Well after checking further I found that the voltage on the white wire is 12 volts to a good ground, after starting engine the voltage at the connector goes up to over 14 volts, using a good ground. OK, the problem is that the alt. is outputting over 15 volts (seems to be too high). Can someone explain this circuit.


1977 26 foot, royale Alamogordo NM

[Updated on: Wed, 11 September 2019 17:33]

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