Tow Doctor Trailer Side Tester Kit

Designed so that one person can make sure a trailer has been wired properly and all functions are working. The unit easily determines correct or miswired connections, burned-out lamps or trailer shorts to ground. Works only with 12 volt negative ground systems.

• Tests all trailer functions: Left Turn, Brake, Tail, Backup, Electric Brakes and Auxiliary power
• Trailer lights illuminate and LED lights on the tester to show function operation
• Adapts to 4-Wire flat, 6-Round Pole or 7-Way RV Flat Pin
• Equipped with a amperage meter that shows actual amp draw. For electric brakes, magnets are activated to determine correct operation