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6/11/14 2:06pm - Original Message: 'GEN light on with ignition off.'
bcousins
Former Member
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Jacksonville, FL - USA

Vette(s):
79 L-82 4-speed. Engine stock except long tube headers. Previous owner replaced upholstery and carpet with OEM. I replaced and upgraded steering and suspension.

Joined: 12/15/2009
Posts: 36
My 79 L-82 GEN light is on with the key off. When I turn the ignition to "On" the light goes off. It stays off when the engine is running. When I disconnect the plastic connector on top of the alternator the light goes off because it powers the light. I get 12.1 at the battery with engine off and 12.7 when running. Bad alternator? Battery is about three months old. Alternator age unknown but I have had the car almost five years so older than that. Any suggestions?

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6/11/14 4:36pm - Reply: 'Re: GEN light on with ignition off.'
bcousins
Former Member
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Jacksonville, FL - USA

Vette(s):
79 L-82 4-speed. Engine stock except long tube headers. Previous owner replaced upholstery and carpet with OEM. I replaced and upgraded steering and suspension.

Joined: 12/15/2009
Posts: 36
Never mind, I got it. Read elsewhere that the problem indicates a burned diode in the regulator/alternator. Bench test confirmed.  Replaced alternator for $50 and solved. Now have 14.28 volts while running and 12.8 when off.

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6/11/14 10:48pm - Reply: 'Re: GEN light on with ignition off.'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
 I was gunna say 12.7 v running isn't working. Glad you got it fixed! Thumbs Up

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