IPA 7865L 7 Round Pin Tractor Trailer Circuit TesterThe 7-Way Round Pin Tractor Trailer Circuit Tester does "one man testing" for male and female 7-way round pin tractor trailer plugs -- and much more! Troubleshoots tractor trailer circuits.
One person can test all the lighting alone.
Allows you to bypass troubled circuits so you can drive away.
Comes with an extra jumper connector.
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