Voltage drops and comes back

Asked by Mar 07, 2017 at 12:57 AM about the 1994 Ford F-150 XLT 4WD Extended Cab SB

Question type: Maintenance & Repair

I noticed that my headlights almost cut out and then comeback to full for a half
second. The volt meter goes flat and then comes back in that same half
second. I thought it was a alternator but I noticed it will do it with the engine off
and electrical on...

1 Answer

74,725

There sounds like a ground wire is not making a good connection. I would start at the headlights and trace back looking for any ground wire, take it off or apart and clean the connections. I would do this with the ground cable on the battery, and from the grounds on the engine, and make sure you get the one that runs to the body.

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