Re: 67 camaro
The GEN is indicating there is not enough current from the alternator for the demand requested and the battery is supplying the current. Happens at idle speed most often; speed engine up, light goes out, hopefully - more current generated.
Problem is either from:
1. Loose alternator belt - loosen alternator and tighten belt.
2. Low output from alternator due to a bad diode within the alternator or a maladjusted voltage regulator - replace mechanical VR with an electronic unit , Wells P/N VR715
3. Poor connections from alternator BAT post/stud to the rest of the electrical system - disconnect ground cable from battery, then disconnect all visual connections you see and wire brush all mating parts, reassemble, and watch the results. The terminals having broken strands should be snipped and replaced.
4. Too low of engine idle RPM - crank it up alittle.
5. Too much current demand from accessories - present design did not include heavy duty stereo amps, electric cooling fans, and other electrical accessories more common today.
Measure charge voltage at battery posts with engine running only, no accessories on, s/b min 13.6 volts after driven on the street for 15-20 minutes. Rev up engine, voltage should go up, max volts s/b 14.5 volts.
With a 37 amp alternator, you were lucky to have headlights at night with wpers on, and defrost on......you carried your nine volt flashlight out the window for additional light.
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