Tests power supply from tow vehicle to trailer and determines if vehicle is properly wired. Tests both 7-way round and 4-way flat tow plugs. Plug into the vehicle’s tow plug and operate lights, brakes and turn signals to test circuits. Reduces trouble shooting time. Tester only.

If you have any questions give us a call during business hours and one of our friendly associates will be happy to assist you. 410-692-5170