I was watching a video the other night where a fellow checked to see if power was making it to the fuse panel . He use a simple tester - the bulbed kind with a sharp pick on one end and a clip on the other, He touched the pick on one of the tiny metal areas visible on the top of installed fuse and held the clip on the other . Could be mice up to dasterly deed s or just a broken wire.
If you go to the Messick's Eqpt site, you can view many diagrams after entering your email and might can find what you need there. https://www.messicks.com/vendor/kubota Good luck.