Turning my headlights on blow the fuses for the running lights and dashlights. Turn signals and brake lights still work
Headlight switch is bad, change the headlight switch itsellf will short out, therefore blowing your fuse. turn signals and break lights are on a different relay, therefore they will still work
SOURCE: Blows fuses when parking lights are turned on. Headlights work fine even running lights.
If it only happens when you turn the switchto the parking lights then it is most likely the swich that is the problem. Light swich failure appears to be a common fault with fords
SOURCE: 200 Cougar blowing headlight fuses
First look for a short or where a wire is exposed and fix that with electrical tape.
If you can not find it, then often I will put a Re-set fuse that does not blow but resets and costs about $5 at Autozone.
Good luck, J
SOURCE: 2006 f150 keeps blowing turn signal fuse
It sounds like the fuse is doing what it is supposed to do, and burning out when there is a short circuit. Check the wiring from the fuse block back to the lights and pay special attention to the trailer connection.
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