Improper resistors.
mabie they could be burning out.
on the brake pedal under the dash is a brake light switch. that when you depress the brake it turns your lights on. you might wanna check that
SLIGHTLY DEPRESS EMERGENCY BRAKE TILL LIGHTS GO OUT DON"T FULLY DEPRESS THEM JUST ENOUGH TO TURN OUT LIGHTS OR ADJUST THE SWITCH AT THE EMERGENCY BRAKE PEDAL TILL THE GO OUT
depress the brake pedal and turn the engine switch to the start posiiton and start the engine,,, Does this mean to hold the brake down until you hear the engine start.
depress the emergency brake. That will shut off the DRLs.
it could be the brake light switch that usually contacts the break pedal when you depress the brake pedal. check that out first.
Check electrical grounds
its a ground wire
EzrvvesnMost likely it's a loose wire or bad ground of the bulb socket. its the hand brake swithch
IT IS LOCATED ON THE BRAKE PEDAL ARM. THERE IS A PLUNGER THAT RIDES IN AND OU AS YOU DEPRESS THE PEDAL
The brake lights and tail lights are separate wiring systems. Even some of the bulbs may have two separate bulbs in the same glass housing. If the bulbs are in fact working, then the next step would be to test the brake switch under the dash. When you depress the brake pedal the switch is pushed creating a connection to turn on the brake lights.
Check all fuses. Wait until dark. Park where you could see the glow of the brake lights from inside the truck, were they to illuminate. Press and hold the brake pedal. Wiggle the turn signal switch about for a few seconds. If this causes the brake lights to work or to flicker, replace turn signal switch. Move tilt steering up and down. If this causes the brake lights to work or to flicker, replace turn signal switch. Switch 4-way flash hazard lights on and off a few times. See if that does anything interesting. Check for Body codes.