GMC Topkick (2007) - fuse box diagram - Auto Genius Jan 01, 2017GMC Topkick (2007) – fuse box diagram. Year of production: 2007. Instrument Panel Fuse Block. There are two instrument panel fuse blocks located behind the instrument panel on the passenger’s side of the vehicle. Fuse Box Diagram > GMC Topkick (2003-2010) Fuse box diagram (location and assignment of electrical fuses and relays) for GMC Topkick (2006, 2007, 2008, 2009).