There are two reasons why a wiring converter like the # 119178KIT would be used on a given vehicle. If the tow vehicle uses a three wire system like your I35, with separate bulbs for the turn signals, and brake/running lights, a converter is used to combine the brake lamps and turn signals onto the same circuit. A vehicle that has a 3 wire system is also referred to as having a 'separate' taillight set-up. A two wire system that has the brake lamp and turn signals combined onto one circuit... view full answer...
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