I believe the the reason your left turn wire was not flashing your test light is you cut it before the left tail lamp. Without a tail lamp your truck will not flash them , same as when a bulb blows. When you fixed the splice, you reconnected the tail lamp so it all would blink. That said, I still say you need a voltmeter to measure voltage under a load(amp draw)at your wheels when you apply brakes. You can hold the pedal down with a bar or stick up against the seat. As you found out, green corrosion creeps in and increases resistance and lowers conductivity of wiring. But above all else, you need to follow logical, step by step, trouble shooting, just as jon f mn says. If your brakes are working but weak, they are losing voltage or ground somewhere and a voltmeter will tell you where. You might light a test light with 6,7,8 volts but maybe you need full 12 volts to fully apply your brakes. Is there 1 or 2 wires coming out of brake ? If 1 wire it would ground thru backing plate. Your backing plate may lose ground connection thru where it bolts to axle hub. You would have to measure voltage at the plate, maybe with wheel off, to prove it out. I wish I lived closer I would love help fix this. Mark
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