1994 ford f-150 5.0l cranks an runs but when you pull the headlight switch on it kills all poer to the motor
You have to check the alternator out put to the battery. Needs to be 14.5v if below that the alternator needs to be replaced.
Alternator is puthing out enough volts has it check 114.6 v
I had the alternator checked out its putting out 14.6
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