Allows one person to test both male and female 7-round pin tractor-trailer plugs and more. In addition, the tester allows you to jump current to a dead circuit during emergencies so you can still drive your rig. Includes an extra jumper connector.
- Allows bypassing of malfunctioning circuitry while on the road
- Slides over 12V supply pin
- ?Winged? tip for easier removal
