Got a nasty surprise today in my garage my 5500 on fire at the rear end, nothing crazy but bad enough to burn up some electrical. Haven't had a real look at it but i'm confused how it happened. Truck hasn't moved since friday, why would something happen today? Considering very few wires have power with everything off. The 7 prong plug I believe is the only thing that would have power there with truck off? There is the 2 trailer plugs, back up camera and taillight wiring there. Other then adding the backup camera I haven't touched any wiring on the truck and no problems at all in nearly 2 years. Obviously I need to tear apart all the wiring at the back of the deck and look at it but i'm wondering if I should potentially be looking further at anything? Shouldn't a fuse have blown first?