Why does my fuse box keep tripping? | Living by HomeServe May 13, 2021If your circuit breaker has tripped, it’ll be down to one of three types of faults: 1. Short circuit 2. Ground fault 3. Circuit overload. Your fuse box or circuit breaker works by detecting any surges or unusual activity and then cutting off the flow of electricity through that circuit if it gets too high. Fuse Box Diagram GMC Topkick (2003-2010) The medium duty truck GMC Topkick was produced from 2003 to 2010. In this article, you will find fuse box diagrams of GMC Topkick 2006, 2007, 2008 and 2009, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.