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