Installation should be easy, wires are color coded and LEDs indicate function. Next to. It doesn't work at all. It has some kind of internal malfunction. I plugged it in and the LED lights work, but the trailer lights didn't work at all, no lights, no brakes, no turn signals (I checked my light bulbs at this point, NP). After reading a few reviews here I figured it was probably the sharp little barbs that needed to cut into the wire to make contact, so I unplugged the wire and plugged it back in. Once again the LEDs say they are working but I have nothing. So I got my tester out, connected it to ground, and all three pins are dead (the LEDs say they're hot), there's no power at the connector. The fourth (earth) has power. It's just a cheap tester, it has no continuity function, it can't catch fire except internal short circuit. It's too late to send it back now. Will avoid this brand in the future.
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