This is off the wall, I know, but you might want to check the bulbs for your brake lights. the brake lights on the truck might have a bulb installed wrong, or the wrong bulb, which is linking the brakes to the turn signals on the wiring harness. That is where I would start. The other thing I would do is to trace the rear harness and see if it has had any repairs done to it, anything that looks retaped, etc...
Was the truck ever in a rear collision, or did it ever have a different bed installed on it?
Are the pins the flat type, with a round center pin? Maybe there is something going on inside the housing, like a loose wire on a screw terminal. I will have to look, but I think ground is the bottom left, bottom right is trailer brakes, right is right green, left is left yellow, then can't remember if running lights is right or left on top. Regardless, you will have to trace the wiring back from the plug to the lights. something is obviously not right.
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