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I think you need a harness for the dual to quad swap.
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I personally went from Duals to Quads and they plugged right in. No harness or adapter was necessary. My truck came with Duals, and I bought a set of custom built Quads from Jeremy at RetroShop. They plugged right in the first time with no issues.My bad. I apologize if I'm wrong. I just thought I had read something because you go from 1 lamp to 2. I may have been thinking projectors
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