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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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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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Duncanville, TX - USA
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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
I was gunna say 12.7 v running isn't working. Glad you got it fixed!
Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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in Forum: C3 Electrical, Body and Interior
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