statesman blown fuse?

I recently bought a used Statesman riding lawn mower. The model number is 13AH660F016. The fuse keeps blowing. A manual did not come with the mower so I am not sure if is blowing due to an incorrect fuse or if this is a common problem that needs to be fixed. I have tried a 10, 15, and 30 wat fuse so far. Any ideas on why this may be happening? Or where we could get a manual to look up the fuse amount. Thanks