SnowDogg 16160200 Plow Light Harness is used on most all SnowDogg plows including the MD, VMD, HD, EX, TE, XP, VX, VXF, and CM snow plows. This is the harness located on the plow side. The light harness is plugged into each plow headlight assembly itself and comes together to one larger plug which plugs into the vehicle side relay harness. If you’re experiencing issues with your lights such as them not switching over to the plow or back to the truck successfully, this may be your issue. Check your wires for frays or cuts and repair as needed.