The brake light switch may be out of adjustment or damaged.
Under the brake pedal is a brake light switch that when you press the pedal it hits it and makes your lights come on..sometimes when they get weak the pedal depresses them simply from the weight of the pedal and they stay on..Have a friend get inside the truck and pull UP on the brake pedal as you look at the lights..if the brake lights go off when they pull up on it..then it is that switch under the brake pedal
the brake switch at the pedal is stuck or out of adjustment.
The part of the car that turns on the brake lights when you apply pressure to the brake pedal is called the brake switch. Releasing pressure from the pedal causes the brake switch to break its electrical contact, turning off the lights.
Follow the brake pedal up behind the dash. The pedal arm ususally operates a button that turns on the lights when the pedal is pushed. The button could be stuck.
check the switch that is located on the brake pedal arm. sounds like it is out of adjustment. pull pedal up and see if switch is still engaged. not sure if this switch slides back and forth or screws in and out. back it off till lights go out with no pressure on pedal.
check the brake pedal, there is a switch on the back of the pedal that depressed when the brake is depressed that turns the lights on, when this is loose it keeps the lights on.
Take your toe and pick UP on the brake pedal. The brake pedal may not be returning as it should.
Check the brake light switch. It should be mounted on the upper part of the brake pedal or the brake pedal frame. If the brake lights go off when you unplug it you have a stuck or shorted switch.
Is it the taillights or the brake lights? If taillights it may be a wiring problem, If brake lights check the switch on the brake pedal
bad or out of adjustment brake switch on the brake pedal arm
The brake lights won't turn off because the brake light switch on the pedestal of the brake pedal needs to be replaced.
brake light plunger switch on the brake pedal maybe faulty, remove it and connect the two wires together and pull apart and see if lights go on and off