Welcome. The AUX system controls several systems including the fuel pump, ignition and starting systems. Most should be on relays though. If I had a wiring diagram I could help you trace it out but all I have is the older 800s..which had two AUX system relays and the newer 950s. There is something on that fuse taking too much power or there is a short in the harness somewhere. Being only a 10amp fuse should narrow it down though. I'll take a look at the 950's diagram and see if I find anything interesting. Is there only one AUX fuse on your 800?

I have found only one AUX fuse

On my 2021 800 zforce, I keep getting the 10 amp aux fuse blowing.  I can replace the fuse and ride it for a few minutes and it blows again, I have not been able to find a short anywhere.  Any ideas?  What does this fuse control?  I know the fuel pump because it will not kick on until I replaced the fuse but is there anything else?