My 2000 260 skid steer parking brake won't release and the boom won't raise. The left pedal will not unlock however the right one does, allowing the bucket to operate when the motor is running. The engine runs for about 15 minutes at 1/3 throttle, then blows a 15 amp fuse to the key switch. The cab harness and the display have been replaced. The previous owner bypassed the safety seat switch and the belt and ran it this way. I am thinking of replacing the seat belt switch. Any suggestions would be appreciated.