We have a Hustler FTSD with approx. 20 hours on it. It was running fine on Friday, we used it at one yard, loaded it up on the trailer, went to the next yard, and we went to back it out, and it wouldn't start. So we checked the fuses. There are 2 fuses: 15 amp - engages the blades 10 amp - ignition The 10 amp fuse for the ignition blew. What would cause this?!?!?!