Review on 🔌 Efficiently Test Your Trailer Wiring with MAXXHAUL 50155 7-Way Blade Trailer Wiring Tester by John Jones

Great concept but only 12 volt light is on. Of course, at first I thought maybe I had a short in the wiring harness or my fuses had blown. Of course I took it to the dealer to check it out and they pulled out the SAME tester! So did he! And that's how I found out that my truck has a feature to check the lights when my trailer is plugged in. When running the test, everything works fine, but when the tester is connected to it, it shows that nothing works. It turns out that the light during the test is so weak that it is not visible under ordinary light. But the 12V light is as bright as day! Not a product worth buying if you ask me.