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 our Dual-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.