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Sort of a basic question, but is the MJ a '2 wire' or '3 wire' set up, the difference being using a standard flat 4 wiring harness or the 5 wire with the converter box? I need to wire my '88 up for towing and any help would be greatly appreciated! Pics/description of where you spliced in would be helpful too. Thanks!

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The MJ doesn't have amber turn signals, so it's all set for a direct splice connection to a flat 4-wire trailer connector. Remember, that's 4 wire. There's no such thing as a 2-wire trailer connection. You need one wire for taillights, one for left brake/turn, one wire for right brake/turn, and a ground.

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