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


Asked by 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


Sounds like the alternator is dying or the alternator belt is slipping. Check the connections at the alternator as well. Make sure everything is clean and tight. HTH. -Jim

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