Just ran into a problem on my 06 dually. My trailer gets no right brake or turn signal but the truck has it. Plugged a tester (lights up different lights for turn brake left and right and so forth)into the 5th wheel socket and it is getting some feedback or power to the turn signals. The lights for the left and right turn are half lit when no turn siganl is on. Wierd thing is it goes away after like 1 min if you sit there and don't do anything but if you turn sugnals or brake on those lights stay on after you shut everything off.

Any advice?