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so then if you unplug the switch on brake pedal the brake lights stay on if so check operation of the hazzards and turn signals could be a short in the turn signal switch or flasher unit also check for pinched wires around third brake light and tail light wireing does your car have trailer hitch ? if so check the trailer plug wireing
Check the brake light switch. It should be energized when the switch is depressed. (constant power in and power out only when pedal is pressed) Taillights and signals power through the steering column and light switch. BUT first check the fuses. I seem to remember there being a fuse for the truck brake lights and another for the trailer brake lights. Use a tester and check trailer wiring brake lights. If they work, look for the truck brake light fuse.
thing to try is this--push and pull the hazzard switch in and out a few times--the contacts may be dirty and not making proper contact. i have ran into this numerous times before, moreso if the person recently used the 4 ways . if that dont do it, check the multi function switch , it may be worn out and the contacts arnt touching the circuit board thus not giving you any turn signals or brake lights (brake lights go through the switck also) hope this helped you!!!
Is this a 4 way or 6 way connection system? If your truck is wrong, then all factory equipped trailer package harnesses would be wrong, tell your trailer guy...I don't think so.
Is this the first trailer you have hauled?
Let me know, and we will go from there.