Review on 5-Way Flat Trailer Wiring Tester with Nickel-Plated Copper Terminals for Male & Female Connectors - Continuity Test for 5-Pin Trailer Light Wire Circuit by Mario Anderson
Great for diagnosing trailer lighting problems
First I got it, went to my car and it freaked me out for a second. My trailer plug only has 4 pins not 5 but I tried it anyway and it worked fine, found the blown fuse, fixed it and all the lights came on with no problems. This way you can find out where the problem lies in the system instead of guessing. I wouldn't leave it attached, just use it to diagnose a problem.
- Circuit Tester
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