Unless fuses were blowing, i.e. underated so they kept popping then the incorrect rated fuses wouldn’t have caused the faults as described because they would still be connecting good enough to work the electronics etc. Also each individual fuse would have only affected it’s own circuits and not others.
Very strange battery fault to have caused the faults
as described too, if it was caused by the battery it might have had an internal connection issue I suppose, causing the voltage to drop below workable limits???
If the auto sparks cleaned up all the connections and pulled fuses out etc. I recon connection issues may have been the actual cure??
I guess we will never really know.
Good to here it’s fixed though.
Roy