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If you put the tester on the outlets and it lights up properly but the bulbs dont, you have already concluded that the wiring isn't the problem. unless of course the wires are corroded and simply putting the bulb in shorts it out. Have you tested the bulbs?
If the high level brake light works, then the brake light circuit is fully functional.
Brake light bulbs may LOOK fine, but can still have failed. Often folks don't notice that one bulb has failed until the second one has blown; it's then easy to incorrectly assume that the fault is more complex.
Try replacing the brake light bulbs: if that doesn't work then please report back for additional options.
I've worked on these the first drove me crazy. its the turn signal switch every thing runs thru these. head lights, turn signal, brakes. except the third brake light. it runs directly from the brake switch. go figuare
I have a 2001 Ford F150, my brake lights dont work. Ive replaced the bulbs, checked the fuses,and the brake switch on side of the brake pedal was replaced. I still dont have any brake lights. My third brake light works fine, along with my running lights,flashers, blinkers.
It's the bulb. There are two filliments in the bulb. One is for when you turn your lights on and the other is for breaking and blinker flashing. When the break filliment goes bad it causes the blinker to flash very rapidly. 100% the bulb. Change it and all will be good again. P.S. if it were a fuse none of the break lights or blinkers would work.
Using a test light check to see if there is power to the wire at the plug where the bulb is for the blinker. if so the socket is bad. if not check to see if the light assembly is working for ex. the parking lights or the brake light ect If those lights dont work then check the fuse for the right rear tail light. Hope this helps.