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The Lone Geek Blog

One geek in a sea of nerds.

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Trailer Light Tester

The Idea

Build a box to test the lights on a trailer without a vehicle’s electrical system. Possibly run from batteries with the option to plug into a 12v source. I want to test the tail, turn, stop, and reverse lights all from one box. Toggleable with swiches to verify function of each set, have leds for continuity and power indicator, make it waterproof. Optional cycle function to test each leg and give an OK indication.