The Reese Towpower 4-Flat Trailer Wiring Circuit Tester is the simplest way to check the continuity of the lighting circuit on your vehicle when you have a 4-flat connector. Plug it in; the indicator will show if the circuit is functioning. The attached molded tethered with loop allows for installation as a cover to protect the 4 flat connector while at the same time testing the circuit when not towing a trailer. Shop this circuit tester and all Reese Towpower connectors and wiring today.

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