My tail lights,dash lights and license plate lights all quick working I checked my fuses and they are all good I even checked them twice three times and changed them for the hell of it and still nothing so I am wondering what the next step I should take if anyone could help me it would be much appreciated thank you


Asked by Nov 14, 2013 at 10:29 PM about the 1991 Ford F-150 S LB

Question type: Maintenance & Repair

4 Answers


First thought is possibly bad light switch. All of those lights are tied together in the running light circuit. Possibly a light relay bad. Or lost ground connection to that circuit.

1 out of 1 people think this is helpful.

thanks dandyoun I will definitely check all that tomorrow


I would check for relay first. They tend to go bad with age.


A wiring diagram and meter is essential here. An inexpensive meter will do the trick. First check for voltage at the fuse box for the various circuits controling that which is affected. If no current present there, work backward. If present work forward.

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