Sometimes fuses just like to say bye bye on their own for no reason. Carry fuses and check connectors, and maybe it was the gremlin.
As with carrying a full-size spare that you keep properly inflated, I suspect that carrying extra fuses prevents blown ones in the manner of a talisman.
I now have 4 spares (hey, they're Mini, takes basically zero extra space!), thus guaranteeing I shall never blow a 15A fuse again.
That forward multi-pin connector (mine has 14, not 9) was kind of a PITA to get disconnected without breaking it, but gentle pressure with a medium-sized flat blade screwdriver & careful tugging will do it:
Looks like mine isn't old enough, and I haven't used hi-beams often enough, to fry it. Other side is similarly healthy-looking, but was too much of a PITA to photograph.
Since I switched to LED headlamps around Xmas, I should be OK indefinitely on that front.
That connector does have a big ol' rubber boot on it - presumably Suzi felt it was good enough to ensure draining water would tend not to drip in from above, or following the upper cable run. But it really should be a Weatherpak type connector! There is nothing but luck stopping a big splash from below from shorting multiple connections at once.
I'm almost annoyed enough to rewire that sucker with a proper weahterproof connector. It would cost maybe $20 in parts & shipping, and I have a Molex tool that makes beautiful terminal crimps. Aptiv 54201456N (https://www.mouser.com/ProductDetail...0C5l9orYBhY%3D
) ought to do it.
Engine ground is worth a look & cleanup, but it'll wait until the next time I need to remove the front sprocket cover.
I rode to work and back yesterday with no further shenanigans occurring. Whatever it is that made the fuse blow, doesn't seem to be chronic.