Hi, I have power to back up lights, turn signals and tail lights, but no brake lights, what should I check? Joe

The dash and tail lights are on two different circuits, and the brake and turn signals are on different circuits, so at least 4 circuits total.
I would start at the headlight switch and check for power on the first two issues.

Well, if you have power on the tail light circuit you should have lights. The tail light circuit is different from brake and turn signal, and they both use the same ground.
Are you sure you have power on the tail light circuit to the bulbs ? And are the parking lights out for the front too ?

Check for Power on your License Plate Light, more than likely you have lost GROUND

Turn Signals, Do the Front Work and the Back don't? If NONE then FLASHER FUSE

The turn signals and brake lights use the same circuit and filament in the bulbs. The tail lights are on the other circuit which comes from the headlight switch.
Do you have power on the tail light fuse ?

check for power at the wires going intop the tail lights, real common that the circuit board is bad, but unlikely both at the same time. The tag, tail lights and brakes are 2 different systems. Do the turn signals work normally? if so the wiring from the turn signal switch to the brake lights is GOOD. the stop light switch had\s a ORANGE wire that should have 12V if not ck STOP LPS fuse, when brake pedal is depressed, the WHITE wire is 12V (at the stop light switch) if that is OK, the turn signal switch COULD be bad. The wiring harness plug is near the back left under the tailgate, see if that is disconnected?

Because the brake and tail(or running lights) are two different circuits. You should find that the stop and turn-signals have their own fuse. Even if the fuse looks okay it may not be. But if you replace the fuse and it still doesn't work try the four-way flasher. If the lights in the rear flash and the brake lights still don't work. Your problem then becomes a power distribution problem. If you know about test lights and troubleshooting this type of problem check for power at the connections for the stop/turn-signal fuse. The power side of the fuse should be the one that has two wires hooked up to it.

It goes straight from the switch to the tail light circuit
make sure you don't have a bad tail light socket


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Hello. Actually the color code for trailer hitches is universal.

• White - Ground
• Brown - Running (tail) lights
• Yellow - Left turn/brake light
• Green - Right turn/brake light

Regards, Joe
PS please rate my answer.

Check at the light socket in the rear, where your lights don't work. You need a test light or a voltage meter, and check to see that you have a groun there, power for your parking light, and power to the brake light. You should have power for the parking lights seeing that it works, and a ground. Just verify that your power for the brakes is getting to the bulb, or not. Just a good place to start.
And you are correct that if the third brake light works (top) your brake light switch is fine.

you prob got a trailer plug prob bad wires if not tail lights run through turn signal switch tell fix ya bout me ok