Have a Car Question? Ask a Mechanic Online.
I am looking at the wiring diagram for your truck and the first thing I would like you to do is to swap the stoplamp relay in the under the hood fuse block with some other relay and see if that corrects your problem.Please let me know what happens,Don
If the relay does'nt correct the problem try replacing the turn/hazzard flasher.This has power all the time from the brake switch and then gets power from the turn fuse with the key on.
Try unpluging the directional switch on the steering column and see if that corrects the problem and if so you will need to replace the directional switch,Don