This allowed me to quickly check my truck's wiring. Looks like a good quality item. I highly recommend installing a 4 wire trailer extension (about 48" depending on the vehicle) so you can run individual tests from the driver's door when using the turn signals, brakes, etc. You can just hang the tester near Cover the back of the car or truck with tape. Also, check your running lights, turn signals, and brake lights with four-position turn signals on to make sure everything is working as it should.
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