What can I say? This is a tester. Plug it in, the indicators will light up when the pen has power. Makes testing easier. I installed new wiring and headlights on my trailer last fall, but before using it for the first time I bought a 2014 Silverado. A bulb stopped working the first time it was used. I needed to know if it was a truck or trailer problem. I bought this and confirmed it was a trailer issue (bad bottom, easy to fix). Now I keep it in my truck's tool box.
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