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Thread: 86 glhs power loss light.

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  1. #1
    turbo addict
    Join Date
    Feb 2008
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    york pa
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    86 glhs power loss light.

    Got glhs 116 runnin after 20 years of sitting. It runs pretty decent at that. The issue I'm having is while sitting at idle the power loss light flickers. If the radiator fan kicks on it stays constant till the fan cycles off. With the lights on or the hvac blower on it will also stay on constantly. With lights and the hvac blower on high the voltage drops to 12.5 or so. The voltage hangs out there and will not recover. The voltage at the field terminals under load is 10 volts. At Wot it will also throw the power loss light then go away once you let off. Had the alternator tested at an auto parts store and they say it's good for what it's worth. The battery is new. No codes currently. I don't have much information on the car as the po died. I'm thinking the stock alternator just isn't cutting the mustard anymore but would like to know if I should check anything else. Rather not throw parts at it. Thanks brandon
    Last edited by bgbmxer; 11-15-2020 at 08:12 PM.

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