Like this, it runs from the battery side on the solenoid to the harness on the top right of this pic. I replaced mine with a mini ATM fuse holder. They're more commonly available than glass fuses. You can buy one at autozone for about $6, or a 10 pack on Amazon for $10. Solder and heatshrink the wires with adhesive lined heatshrink and pack the fuse socket good with dielectric grease. I believe it takes a 10 amp fuse, but maybe 5 amp. It says somewhere in the manual.
While you're in there, I'd plug and unplug all the bullet connectors a few times to clean off the corrosion. Take some pliers and lightly squeeze the female side with it unplugged so it makes a solid connection. Reassemble with plenty of dielectric grease.