Believe it or not, I have had to disconnect the cig lighter in order for the tail lights to work. Sounds far fetched but it does work!
There is a short in the signal light circuit.
Check the fuses for your brakes.
dash panel lights working? all fuses ok?, check on the fuses box under the hood it's a number 10 red, check if keeps blowing up
Are you blowing fuses or are the bulbs blowing? Blowing fuses would be a sign of any wires or metal contacts in your brake circuit grounding out or shorting on themselves. You'll have to check all of the wiring in your brake light/switch circuit to be sure.
Check fuses for brake lights. If your brake lights aren't workings the truck will not release the parking pin as it needs the signal from the brake switch on the pedal.
Try checking the tail light relay.
It needs checked out but both the hazard and brake lights go through the turn signal switch.
Blade Type ATO/ATC Automotive Fuses: 10A for the turn signal lamps & 15A for the Brake/Hazard Lamps. Hope that helps.
Check the fuses.
The brake lights and signal lights are tied together in the signal switch, also known as the "multifunction switch".
check all brake bulbs a filiment may have shorted out
Probably the flasher unit needs to be replaced. This is an electronic switch which usually mounts underneath the dashboard.