John Wood Nut Swinger
^^^^^ Look at this first.Did you check the ebrake? Otherwise the switch mounted on it is probably messed.
Here is a little story for you. I got to tinkering one day with my chip. When I fired it back up the brake light was on. I climbed high and low looking for something. The last thing I checked was the plug on the brake. Guess what? I bumped the plug off the switch.