If your battery terminal screws are tight (and the shop manual's torque spec is way too low, IMHO) and you've added star washers (and I also put blue thread-locker on the bottom of those bolts, and di-electric grease on the top), it might also be a problem with the (hard to get at) main breaker bus.
There are several threads on this, and I carry a NAPA replacement in a saddlebag (along with a Sav-Ur-Ride clutch cable). Take a look at this thread page, for instance: https://www.victoryforums.com/showthr...t=53633&page=2
I second or third or fourth the notion of never using a pressure washer. I mean, you can get water in electrical parts, such as that fuse. And people have problems with the factory cruise just from riding in the rain, never mind pressure. And besides electrical stuff, a minor aiming mistake can possibly get by a wheel-bearing seal, and lead to bearing failure. And on and on.
I ride in the rain on multi-day trips, of course, but other than that I never even use a hose -- nozzle or no nozzle -- on the bike. I keep it very clean -- it's a good way to bond with the bike, and you're more likely to notice loose fasteners, damaged parts, etc. -- but I do it all with waterless spray-and-clean products and lots
of micro-fiber towels (which I buy in bulk from Sam's Club every few months).