Works as expected. I set my phone to record the lights on video. Then I hope that all the lights (turn signals, running lights, brakes, etc.) in my truck are running. Watch the video to see which one isn't working, and then troubleshoot if it is. A voltmeter is also suitable for this, it is simply easier. It's a good idea to bring when buying an old used tow truck. So if the salesperson at the dealership says the trailer lights are working, you can immediately prove the opposite. Too bad he wasn't with me in the parking lot. Save me the trouble at home.
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