It is most often the solenoid on the trailer is faulty. You can verify the reverse lights not working by turning the plus sideways and plugging the brown wire into the pin for reverse lock out, that is the blue wire pin, then turn on your parking lights and try to back up. If you they lock out using the brown wire to blue wire with parking lights on, then you have a bad pin, wire or reverse signal for the solenoid. These are the only factors that are easily an issue. BCBLast edited by Bass Cat Boats on August 2nd, 2009, 9:46 pm, edited 1 time in total.