electrical short in 12 volt

[layne]

Sorry if this has been covered somewhere, but I couldn't find it. Here's the problem:

No light above the bed (dimmer) noticed first. Then no power to awning and 12 lights in basement. Fuse blown in box--red light on the one that says "awning". Changed light bulbs above bed first, still no llights. Disconnected wires to awning motor and checked all light bulbs in basement. Greg from factory said to check for anything that looked burned. Nothing that I can see looks burned. Everytime I try to put in a new fuse, it sparks and blows before I can even get it put in. Any suggestions? Thanks.