Designed so that one person can make sure a vehicle wiring harness has been wired properly and all functions are working. Tests all tow vehicle functions: ground, auxiliary power, brake, directional and backup. Works only with 12 volt negative ground systems.
Adapts to 4-Wire flat, 6-Round Pole or 7-Way RV Flat Pin
Heavy-Duty, 20 foot extension cord is included
Saves time and the cost of a second person at the rear of the vehicle
