1998 Ford F-150 Repair Question
Ford F-150 Battery Problem
Check for a blown 15 amp fuse under the hood. If it's okay, measure the voltages on the wires and tell me the wire colors and the values you get. We already have one valuable clue when the battery light circuit is working. That's the "turn-on" circuit for the voltage regulator.
The voltage on the white wire has to be measured when the engine is running.
17,277 answers provided