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REESE Towpower electrical 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; 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.
REESE Towpower 4-Way Tester checks each electrical circuit for continuity
Red LED indicator
Compact design for easy storage
Designed for 12V vehicle systems