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the new tail lights that came with my under tail have 3 wires comin from each light and the stock harness has 3 wires from it. obviously the ground is black so i hooked that up and when i hook us the other 2 the light comes on but doesnt get brighter when i pull the brake and if i switch the other 2 wires and leave the ground the same thing happens.. any idea on how to do this the right way? thanks