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Old 12-29-2018, 12:52 AM   #5
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Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,294
Re: another alternator thread...

Originally Posted by dmjlambert View Post
One more thing. If you have an instrument cluster with warning lights (as opposed to the more common instrument cluster with gauges), make sure your GEN warning light is not burned out. The GEN light should light up during starting, providing a built-in bulb test similar to the bulb test for the BRAKE light.
Small correction.
The GEN light will come on with the key on to ignition. It gets power from the key switch and grounds through the alternator diode trio. It stays on until the alternator begins charging and back feeds positive voltage back to the light to match the positive voltage from the key switch. The two positive voltages without any negative voltage will turn off the light.

The other light is the temperature warning light.

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