The truck plug has 12 v to yellow and green when you turn on either turn signal, and you say it is a factory coupler? everyone keeps saying ground, ground ground ground... how can anyone say ground if you are testing it without the trailer plugged in? you didn't mention if you tested it that way, or if it even is a 4 wire plug.
regardless, most set ups stick with green on right, yellow on left, BUT when you hit the brakes, it puts 12 volts to BOTH wires to turn them both on. So, if someone wired the yellow and green together with the truck brake lights, everytime to give input to yellow, green will also light up and vice versa...
so...
just something to think about...
would need a lot more information before anyone could just toss a diagnosis out there.
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