The stop/turn signals are completely separate from the brake control wire in a TT or fiver. A failed stop/turn signal is not an indicator of a brake problem. And conversely a failed brake has no effect on the stop/turn signals.
If you pull the Bargman S/T/T fixture off the back of the trailer, there should be a hole about 1" in diameter where all three wires go from the fixture into the wall of the rig. You should be able to pull out a couple of inches of that wire bundle to the point that three wire nuts appear. Each line (ground, stop/turn, and tail light) will have its own connection. I would look there after checking the 7 pin and pigtail for good ground and voltage. A loose wire nut or oxidized wire in that connection bundle is pretty common.
Prying that Bargman STT fixture off the back can be a chore. Remove the red lens and pull all the screws. You'll have to figure out how to gently pry the fixture away from the butyl putty tape. I use gentle heat (momma's hair dryer) and a plastic putty knife
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'11 Cougar 326MKS loaded with mods
'12 Ford F250 SuperCab 6.7 PowerStroke Diesel
Amateur Radio: KD2IAT (146.520) GMRS: WQPG808 (462.675 TPL 141.3)
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