Boss Part # MSC09417 - 13-Pin Plow Side LED Lighting Wiring Harness is the harness located on your plow itself going from headlight to headlight before coming out to be plugged into your vehicle plug once attached to your vehicle. This is used on all Boss RT3 plows with the newer SL3 LED lights with 13-Pins only. This is an OEM wiring harness from Boss.