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Today we're going to be taking a look at the Hopkins Tow Doctor Vehicle End Test Unit, part number HM50918. Now you can check your vehicle's wiring harness without the need of a second person. The Hopkins Tow Doctor features a 20-foot heavy duty cable so you can check it from your cab. It tests ground, tail lights, left and right blinkers and brakes, back up, electric brakes and auxiliary power.… see more >
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