Availability: 15 in stock

Test light signals coming from the tow vehicles with 7 round pin tractor trailer plugs.

One person can now test all.
The 7 Round Pin Tractor Trailer Circuit Tester does ‘one-man testing’ for male and female 7 round pin tractor trailer plugs and much more.
•Troubleshoot tractor trailer circuits•One person can now test all the lighting •Allows bypassing of troubled circuitry while on the road•Eliminates guesswork•Packaged with an extra jumper connector“Winged grip for easy removal from electrical connector