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Home » Public Forums » GMCnet » Generator light on ... alternator is charging... (What would make the light stay on?)
Re: [GMCnet] Generator light on ... alternator is charging... [message #315148 is a reply to message #315111] Mon, 27 March 2017 10:04 Go to previous messageGo to next message
amdgmcman is currently offline  amdgmcman   Canada
Messages: 76
Registered: April 2007
Location: Long Beach, CA
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A bench test performed on the alternator showed that a diode was bad. After dimantling it and further investigation the capacitor was defective as well. I also noticed that the unit had an unusual whine since it was installed. Needless to say I replaced it & all is well.

AMDGMCMan
Alan M DeLuccio
78 Royale with
Coachmen,Center Kitchen Floorplan
09 Harley Davidson Street Glide
65 Corvair Monza Convertible
96 RAV4 2 door Manual 4WD
Long Beach, CA

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Re: Generator light on ... alternator is charging... [message #315151 is a reply to message #312821] Mon, 27 March 2017 20:24 Go to previous message
JohnL455 is currently offline  JohnL455   United States
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
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Senior Member
A bad diode will cause 1 of 3 phases to be missing. The "gap" in output will cause louder whine. This may have taken out the filter cap is my guess.

John Lebetski
Woodstock, IL
77 Eleganza II

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