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I just bought this truck and previous owner was having trouble with brake lights. He wasn't able to fix it. I have inherited that problem.
Basically the yellow ABS light is always on. As soon as you touch the brake pedal the fuse blows. No brake lights in the rear or third brake light.
So far to try and figure it out I have disconnected:
BOO (Brake on off switch) tested and jumpered OK
Cruise control actuator (under hood)
Crusie control brake sensor (on master cylinder)
RABS valve electric connnector (under master cylinder)
Multi Function switch(turn signal/hazard)
3rd Brake Light
Factory towing harness (Rear)
Factory electric brake controller(Cab)
Cut Light Green and Light Green/Red wire to brake lights under cab in harness
Removed aftermarket alarm
Checked Fuse in small fuse box under hood for towing package
After each of these I tested the brakes by installing a new fuse and jumpering the BOO connector to simulate pressing the brakes. Every time the fuse pops immediately.
They are all still disconected and it still blows the fuse. I'm running out of ideas and the forums aren't giving me any new ones.