40-50928 TOW DOCTOR TRAILER WIRE

Tow Doctor™ Trailer Wire Harness Test Unit

• Tests all TRAILER functions: left turn, brake, tail, backup lights; electric brakes and auxiliary power
• Designed so that one person can make sure a trailer has been wired properly and all functions are working
• Trailer lights illuminate and LED lights on the tester to show function operation
• Adapts to 4-Wire Flat, 6-Pole Round, or 7 RV Blade
• Includes battery terminal clips. Can be used with any 12-Volt battery
• Amperage meter shows actual amp draw. For electric brakes, magnets are activated to determine correct operation