'95 chevy 1500 ext cab, this one is bizzare because the chmsl works fine. No trailer stop lights either.

As long as I'm complaining the blinkers short out wet or dry regularly and have for years. I replaced the multifunction switch & no improvement on that one.

The tail and clearance lights all work on both truck and trailer.

Any advise from the guru's?

under hood fuse?

The high mount has its own circuit just to let you know..

I would guess a short circuit in your trailer connections somewhere blew your fuse and the third brake light works because it is on its own circuit IIRC from my '97 I had.

trialer wiring first, the brake switch, in on the orange and out on the white, if you get a new b-switch, get a new retainer as well....

Brake lights turned out to be the 30A fuse under the hood.