Vehicle Questions and Answers
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If your Ford F-150 doesn't have functional brake lights or turn signals, the most likely issue is a faulty switch. To troubleshoot, try disconnecting the brake light switch and connecting the wires together. Another potential problem could be a blown 15A brake relay fuse labeled "Brakes/Signals" in the fuse box. Make sure to check this next. If the problem persists, inspect the electrical system for any potential shorts that may be causing the malfunction. Ensure that all bulbs in your lights are working properly as well; if any are broken, no amount of switching will illuminate them.
Combine interior fuse box
One of the first things to investigate is whether the issue lies with the fuses. If you find a blown fuse, swapping it out for a new one should resolve the problem.
The rear lights that signal braking and indicate the back of a vehicle are not functioning as they should.