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What are the Functions of the Lights for Trailer Wiring 4 Pole Flat LED Tester # I26


There are no instructions about what the lights on I26 should be for a correctly wired and fully functional 4-wire adapter. What do the 3 lights indicate?


Expert Reply:

From left to right the first light tests running lights, the middle light tests left turn and brake lights, and the last light tests right turn and brake lights. On a 4-Way flat vehicle connector, the one exposed pin is the ground, next to that is running lights, then left turn and brake, and the last pin is right turn and brake.

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