This circuit tester plugs into the 7-way connector on your truck. LED lights indicate which functions (brake, turn, tail, stop, reverse and 12V) are properly working.

Circuit tester plugs into your 4-way flat trailer wiring harness and identifies lighting problems. Labeled LED lights illuminate to show which functions are working properly.

Use this tester to check the connection between your tow vehicle's 7-pole, blade-style connector and your brake controller. Tester emulates trailer to confirm connectivity. LED lights illuminate to show each function is working.

This Brophy electrical tester works for both 4- and 5- way flat trailer wiring harnesses.

This powerful dual range heat gun lets you remove paint or putty, bend plastic pipes, and more. There are 2 temperature settings and 4 nozzles to choose from. Hanging hook lets you store the heat gun when not in use. Durable plastic construction.

This black self-fusing tape is ideal for almost any application requiring a waterproof seal and is an excellent insulator with high dielectric strength.

Heat-shrink tubing shrinks when you heat it to create a seal around wiring. Can be used to bundle wiring together, create joints or splices, or act as protective insulation for exposed wires.

Use this kit of 25 cable ties to secure your wiring and prevent road hazards. These black wire ties are UV-resistant, have a 50-lb tensile strength and are 11" long.

Use this kit of 10 cable ties to secure your wiring and prevent road hazards. These black wire ties are UV-resistant, have a 50-lb tensile strength and are 14" long.

Use this kit of 25 cable ties to secure your wiring and prevent road hazards. These black wire ties are UV-resistant, have a 50-lb tensile strength and are 14" long.

Use this kit of 10 cable ties to secure your wiring and prevent road hazards. These black wire ties are UV-resistant, have a 50-lb tensile strength and are 11" long.

Use this kit of 10 cable ties to secure your wiring and prevent road hazards. These black wire ties are UV-resistant, have a 18-lb tensile strength and are 6" long.

Use this kit of 25 cable ties to secure your wiring and prevent road hazards. These black wire ties are UV-resistant, have a 18-lb tensile strength and are 6" long.

This adapter lets you test a 7-way, round-pin, vehicle-end connector to ensure that all the wiring functions are working properly. Plugs into the extension cord on your Hopkins Tow Doctor wire harness tester (HM50918; sold separately).