2001 ford explorer sport rear driver side turn signal and brake light dont work.

check brake light switch on brake pedal arm. Does high mount stop lamp work?

No, because the left side is still working. The loose wiring was to the multifunction switch (turn signal).

Power gores through the turn signal switch to the brake switch on the brake pedal, then to the rear lights. Does the highmount brake lamp work?
At the RH lamp socket, Measure the voltage between the RH rear lamp C4032 pin 3, circuit 5 (OG/LB), harness side and ground. Should be 12 volts.

try that first.

Did you change the front and rear bulbs?

Assuming you've already checked fuses, look to the turn signal switch.

PROBLEM COULD BE THE THE MULTIFUNCTION SWITCH. IT CONTROLS HEADLIGHTS, TURN SIGNAL LIGHTS AND BRAKE LIGHTS SHARE THE SAME CIRCUIT.

Sounds like a shorted out wire somewhere, its a pain an i had to have mechaninc do mine twice. Have them check in the steering column i hear its a common thing!! good luck

check the wiring to the rear sockets, including grounds then work your way forward, check the brake light switch then the signal light switch which i figure is bad but no sense replacing till you know everything else is good

if it's only the rear turn signal that does this, check the plug where the bulb snaps in. if loose or bad connection to bulb, it will sometimes work and sometimes not. if its both the front and rear turn signal bulbs, could be the combination switch. these were common failures on fords

The ford explorer sport track. Will have a short either at the plug of the multi-function switch or 6 inches down where the column bends the wires during tilt.

Rear lights are double filament bulbs one side for the lights other side for the brake/turn signals so it still may be a bulb. Do u have a test light or volt meter you can check to make sure u have power there when brakes or turn signals are activated. Or just try another bulb.

Due to poor design on Fords part. When you use the tilt often, the wires inside due not have enough relief. They are to tight. My 02 sport track had same problem. Wire actually broke off inside the steering column. Take off the lower then upper plastic around column. You probably have broken or loose wires