Hi Chris - You probably remember this, but because your Chamonix car is an older model than your Malaga car I'll mention this again. On the earlier version of our cars, there is unswitched power distribution in the fuse block between fuses 4 and 5, and switched power distribution between 6 and 7. The obvious point of this is when you pull fuse number 4, all the upstream stuff from fuse 5 and more importantly all the downstream stuff from fuse 5, is still connected to the upstream stuff from fuse 4.
You need to take this into account as you do your continuity tests to try to chase down the damage from your melted wire.