This longer wiring harness is optimized for installing DENALI auxiliary lights in full sized Jeeps, trucks and cars.The harness features our clever HotSwap design that enables an effortless swap from the standard single-intensity relay to ourDual-Intensity DataDim Controller. (sold separately) Plug in our DataDim Controller to enable the DENALI lights to switch between half and full intensity with your vehicle’s original high beam switch.