Trailer Wiring Systems 
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![]() THE TOW DOCTOR IS DESIGNED SO THAT ONE PERSON CAN MAKE SURE THAT A VEHICLE WIRE HARNESS HAS BEEN INSTALLED CORRECTLY AND THAT ALL FUNCTIONS ARE WORKING |
Complete Vehicle Wire Harness Test Unit It tests all tow vehicle functions including ground, auxiliary powerlead, brake controller, directional and backup lights. It adapts to 4-Way Flat, 6-Way Round, 7 Way RV Blade, 7-Way Pin (Round) Heavy duty adapter for tow doctor. 7 way round to 7 way flat (can be purchased separately) Heavy duty, 20" extension cord is included. Puts you in the driver's seat with testing. Comes with attractive durable storage case to protect unit Saves time and the cost of a second person at the rear of the vehicle $202.49 |
![]() Test Functions: Left turn signal Right turn signal Brake lights Running lights Electric Brakes |
Complete Trailer Wiring Test Unit The trailer doctor is designed to completely test trailer lights, turn signals, and electric brakes. The unit is totally self-contained with an internal battery, battery charger, and features all of the popular trailer plugs. Simply plug the trailer into the box and push the appropriate lighted button for each function. No more using your truck to test the trailer, no more using a battery with a jumper lead! This simplifies isolating the truck problem from the trailer problem. $311.49 |
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