Hello there, its been many years since working on our 55, but I think the fuse is under the cowling where the on_off switch is. At least a place to start perhaps..Dave
Depending on the vintage of the machine it can be in different places. I suspect it is inline at the lh rear corner of the grain tank where the wiring harness is routed from the engine to the platform area. Some models have them inline under the shift lever area and some might have them near the steering wheel.