what causes a 94 F150 to discharge amps when headlights are turned on and then the check engine lights comes on

Asked by Alexdog8 May 23, 2015 at 11:52 AM about the 1994 Ford F-150 XL 4WD SB

Question type: Maintenance & Repair

The amp hand drops real low when the headlights are turned on.  Then after a few minutes the check engine light comes on. The radio, ac, and dome light together do not affect the amps. Only the headlights.

1 Answer
10

Lonnie answered 6 years ago

check ground cable. your headlights are run directly off of battery while other devices are run off alternator,

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