Ideas!

[Scubatech]

Listen to my man here........


I have been doing electronic for over 30 years, no I ain't not no expert (purposely spoken), but I have seen my techs get burnt on something was damaged down stream from the fuse. I may have been as well for that matter. The term slow blow is used frequently in our NAV-Aids.

I just learned that lesson.

 

[Scubatech]

Good news - you have been very fortunate.

The lessons then - check fuses with a meter, not by eye. And ........ Yes, I've been there & tied myself in knots before now.
Secondly, tie the earth/neg lead away securely when working on the battery & only ever reconnect it last.

I definitely learned from this.