MICTUNING HD 300w LED Light Bar Wiring Harness 40Amp Relay ON-OFF Without Switch(1Lead 12Feet 14Awg) MICTUNING HEAVY DUTY 1 lead Wiring Harness without switch and ready to connect rocker switch,easy to install. DETAILS MAKES PERFECT: adopt 14 Gauge flexible strand copper wire,up to 300 watt load capacity.It is universal fit for any 7" 10" 12" 20" 30" 40" 50" light bars that is within 300w. GREAT CONSTRUCTION: 40A Power Relay & Inline Blade Fuse for multiple safety protection.It is 1 lead that with one lights output connection,it can hook with 1 heavy duty off road led light bar above 180w. 12FT Extendable Wiring Harness:more than 12ft of wiring from relay to lights that is plenty of length to put it where you want, NOT LIKE OTHERS' ONLY 10FT. CAUTIONs:We recommend professional installation,pls let professinal installer to wire the harness kit; If let the wire short circuit,the harness would melt and even caught a fire,We suggest that wrap all exposed wire with electrical tape to avoid a short circuit; Pls make sure your light within power 300W, or it would got melt as well.