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Message: <blockquote data-quote="overboard" data-source="post: 444233" data-attributes="member: 6547">Sounds like a faulty converter to me ????  Foreign vehicles have 5 wires that need to be reduced to 4 (converter), reason being they have 2 individual tail light bulbs with individual functions that need to be combined so that a single 1157 bulb on the trailer will perform both functions. I recently replaced a converter on my Tacoma and I think it was also the brown wire that was causing the problem, all lights work fine since I replaced it. I've had to replace several trailer wiring harnesses with converters on other Toyotas that stopped functioning properly, pretty easy now that they are plug and play. Mine had power in all wires to the converter, nothing coming out of 1 of the corresponding color wire on the opposite side, bad converter!Before I start poking any holes in any wires, I would check for power at the plug first.</blockquote>