Still having problems, if brake lights are on and you turn either signal on the brake light goes out. left and right both do it. Ran power to each light front and back at switch connector and each light worked fine all 4 corners.
With TS switch on L turn the L brake light SHOULD go out (and left turn should flash)
With TS switch on R turn the opposite
TS flash power comes through key to fuse "switched buss" -----through fuse supplying flasher ----- through flasher -------INTO TS switch
You MUST check for flasher power with key on and with TS switch in a "turn" postion to put a load on that circuit. Check for power at flasher and at fuse panel.
Do you have a FACTORY manual? If not download one here