Which is what happened to my '85 at Thunder a few years ago. The main fuse melted in the holder due to a loose fit. I went off to Auto Zone, and bought a replacement. Cut out the old one, and used 2 PosiLocks to attach the new one. When I got the bike home, I put in one of those really good Delco connectors from Eastern Beaver, and have had no problems since. Resistance kills those connectors. How many of us have smoked the 3 wire one coming out of the stator? I'd suggest everyone who rides a Max get a collection of PosiLocks. Not many soldering guns out on the side of the road when you fry a connector.
Cheap Chinese fuses have thinner metal in them. They don't get gripped by the connector well. Tiny arcs eventually cause resistance, there ya go.. You should have to give a fuse a bit of a push with your thumb to get it in the holder. If it just slips in, it's too loose.