I have a 93 land cruiser and something is wrong with the trailer wiring harness. Only the left side seems to work. When turning on the right turn signal, the left blinks, and the right side will not light up under braking either. The left signal works properly and it will light up under braking. This happens on several trailers ive towed, so its not the trailer wiring, its the harness on the vehicle. I ran a multi meter as well to confirm that its the vehicle wiring thats messed up. I don't believe its the plug its self. Any clues?
test with a test light from plug to where it hooks to harness . make sure ground is good
Since it is on everything you tow. I would agree the wiring problem is on your land cruiser. unless you only tow boat trailers that have been dipped in the sea and they have corrosion or a bad ground on the right side. if your land cruiser tail lights work correctly than I would say you need to take your meter and verify the right hand light power, if that is not correct. than it is the connection where your pigtail is tied into the factory wires.
