Seller notes

l 【Function】This 7 pin light tester is designed for to diag wiring issues with both truck and trailer, especially if your lights fail at night, you can know where the problem is in less than 5 minutes and make timely repairs, This will help avoid opening the hood and changing a fuse in the middle of the highway.l 【EXCELLENT PERFORMANCE】The 7 round pin circuit testing is a great way to test your trailer circuits at the 7-way socket, including left and right turn signals, hazard lights, br...

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