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Identify wiring issues such as short circuits, fuses, test connections, wiring harnesses, and more with the ABN Wire Piercing Circuit Tester. It can be used in the shop to check wires when installing radios and brake controllers, on your camper to test which wires operate the tail lights, or any trailer wiring. Use in the shop to check wires when installing radios and brake controllers, on your camper to test which wires operate the tail lights, or any trailer wiring application. It includes a high visibility LED bulb for easy identification so you don’t have to worry about estimating or guessing. The 12-foot cord is insulated for heat and oil resistance as well as safe use. It includes thick gauge wire and a large alligator clip for grounding. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.