Fleece Performance Engineering -GM-ALO-37 Gm All Lights On (2003-2007 Classic) ALL LIGHTS ON: Simply install the module to allow your high-beams, low-beams and fog lamps to simultaneously illuminate the road ahead SIMPLE UPGRADE: The module installs right inside your fuse box. It keeps things looking nice and clean and you won't have to worry about any wires wiggling loose. EASY INSTALL: Installs in 5 minutes or less. Simply remove the relays shown, lay the module on your circuit board, and reinstall the relays. FITMENT: Fits on 2003-2007 full size GM trucks (2005-3500 Silverado/Sierra) or if your fuse box is laid out like the one shown in the photos NORMAL FUNCTION: When the high-beams are not turned on your low-beams and fog lights will function normally