You have a poor or no ground between the vehicle and trailer.
you probally need to replace the bulbs
just as the name it makes the brake lights come on when u press on the brake pedal
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
More than likely there is a switch near the top of the brake pedal that is faulty. It usually looks like a small button that is released when you press on the brake pedal which turns on the brake lights.
it's somthing under the brake pedal, it's sticking and just needs to be loosened. you'll also find when you press the pedal in, the brake lights will go off.
There must be a short in your wiring...Especially if you have trailer wires...I have the same problem on my Silverado....Haven't fixed it yet but narrowing down the possibilties...Good Luck
put your foot on the brake pedal and press down while some one looks at the brake light to see if it lights up
Check the fuse, bulbs and actual regulator switch in that order
Adjust or replace the stoplight switch at the upper end of the brake pedal under dash area
you need to get a bigger fuse
It could be a fuse. If the brake lights do not turn on when you press the brake pedal check your fuses under your dash.
Out of adjustment. Adjust the mounting of the switch so the brakes lights are off until you press the brake pedal.