SnowDogg Part # 16071110 - Headlight Adapter, GM Inline 1500 07-13, 2500/3500 07-14. This GM 8 position plow prep, upfitter breakout connector, is used on 2007-2013 GM 1500 vehicles as well as the 2500/3500 2007-14 GM vehicles. This harness plugs directly into your vehicle's lights and plugs into your wiring harness in order to allow your vehicle's headlights to switch to plow lights when connected.