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The trailer has a 7 pin female plug and is wired corectly. I put a male plug on my ford using the the three wires for lights and it works fine. When I try to do the same on my 87 suburban the olnly thing that works correctly is the left turn signal. When I turn on the right signal all the lights flash. When I turn on the running lights and try the turn signals all lights flash and when I hit the brakes all lights go out. Any suggestions other than get rid of the suburban?
SOmthing definately got wired weird on the Suburban, or maybe its just possesed. Serously as a random guess the trailer is not properly grounded to the truck. I (again guess) think the marker lights and the ground are reversed on the truck plug. Good Luck