I own a RTV1100 so not familiar with yours, but a blown fuse is usually due to overload. Like adding accessories to a circuit that makes it draw too much voltage etc. or a wire that is rubbing and shorting out on something. Good grounds are important as well.
Suggest you trace back from the starter and look at the wiring for breaks or loose or corroded connections.
Do you have a manual? Can you check voltage etc?
Don't, whatever you do, put a bigger fuse in it to solve the problem. The damage it will eventually do will cause more problems and take more money to fix.