My brake lights wont work on my 93 ford explorer but when I turn my head lights on all the lights work just not the brakes?

Answer 1

The brake lights are an entirely separate system from the head/tail lights but have a lot in common with the blinkers and four way flashers.

TO test the bulbs try the blinkers. If you get the same bright-red lamp that your brakes should use, your lamps are OK.

Look under the dash at the top of the brake pedal. There is a switch on the pedal connected to two wires in a black jacket. That is the brake light switch. If you unplug the wires and read the voltage at the plug from pin to ground, one should have battery voltage. If there is no battery voltage then the fuse or the wiring between the fuse block and the switch is bad.

If there is voltage, short across the two pins. This should light up your brake lights. If the brakes light, the switch is bad and needs to be replaced.

If you you have voltage and don't get lights when you short the pins then your wiring between the brake pedal switch and the brake lamps is bad. You will probably need to involve a garage at that point.