TowBrite 4-pin Round Truck Tester allows you to check for output voltage on your truck when actuating the Left, Right or Running lights. Individual LEDs on the tester illuminate when voltage is applied. Integrated 100ohm resistors bypass issues caused by some vehicle trailer and anti-theft systems.
Use this tester to verify if your 4-way round connector on your tow truck is wired correctly.
The 4-way round connector is frequently used on tow trucks and other commercial vehicles.