Quote Originally Posted by Crappiecrazy fireman View Post
I was out on the lake today and suddenly my trolling motor kept blowing the 40 amp in line buss fuse. When I would replace the fuse, the trolling motor would run until the head was about a foot under water, then the fuse would blow again. Anybody have any idea what could be causing this? When I got back home to charge my batteries I noticed the wingnut which connects the trolling motor to the battery was very loose and not tight at all. Could this have beencausing the fuses to blow? I cant really tell if that was the problem until I put the boat back in the water. I hate to plan a fishing trip and think the thing is fixed and the first time I put my trolling motor in the water it starts blowing fuses again. Any suggestion?
Yes, it could very well have been your problem. Poor contact = resistance. Resistance = heat and heat = blown fuse.

BTW the fuse is there to protect the wiring. Putting in a bigger fuse is just asking for some melted wiring and perhaps some burnt stuff as well. If its been working all this time with that sized fuse, I'd stick with it and find and correct the problem.