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Description: Trailer Circuit Tester; 4 Way and 7 Flat Pin; Tests Trailer Circuits Quickly and Easily on Most 12V Trucks and Campers This circuit tester is a nice tool to have on hand to check the electrical connections between a tow vehicle and a trailer. Unlike ordinary separate 4-pin or 7-pin testers, this 2-in-1 design allows you to have both 4-pin and 7-pin testers, making it easier for you to use. Simply plug into vehicles tow plug and operate lights, brakes and turn signals to test circuit...

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