Alternator Discharge Light
The purpose of the Alternator Discharge Light or "Charging System Light" is to provide a Charging System self-test and to alert the driver if there is a problem in the Charging System on their vehicle. When the vehicle is first started, the Charging System Light should illuminate and then go out within 1-2 seconds. If the Light behaves in any other way, the Charging System should be inspected.
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Normally on startup all the dash lights including the charge light come on, and then all go out when the car starts....
Charge light comes on truck won't start