Make safe, temporary repairs on the road with a 7 round pin tester. Features an emergency by-pass to jump power from the feed to a broken circuit. Works with negative ground trucks. Tests circuits by plugging into the cable and checking each lighting system circuit. Identify faults easily and by-pass issues with a flat brass jumper cable.

4/5 pin tester designed for quick and accurate testing of vehicle systems. Connects easily to the trailer plug socket to activate lights, brakes, and turn signals, identifying failures in the truck, cable, or trailer. Features an easy-to-connect ground terminal for trial light setup.

LED lights indicate circuit completion and current flow. Harness checkers trace lighting functions to the truck side terminal. Weather-proof design with winged grip for easy removal. Quickly tests vehicle systems and identifies wiring issues on both truck and trailer. Ideal for fleet vehicles.

LED lights indicate circuit completion and current flow. Harness checkers trace lighting functions to the truck side terminal. Weather-proof design with winged grip for easy removal. Quickly tests vehicle systems and identifies wiring issues on truck and trailer. Ideal for fleet vehicles.

The adapter adapts a 7-way flat pin connection to 6 Round and 4/5 pin connections, featuring sealed plugs that keep road debris from corroding the connections. It serves as one adapter for all trailering needs and includes a winged grip for easy installation and removal.