Sorry. I’ve been out. If you have power at the fuse (and beyond it) and do not have 12V power at the fridge, then - by process of elimination- you have a bad line or a break in the line from the fuse to the fridge. - or a bad ground. To test that this is the problem, you can splice in a line from any good 12v line and hook it to the fridge and see if that works. Or just run a temp line directly from your coach battery (with a fuse between the battery and the fridge) and see if it works. If this turns out to be the issue and the fridge and furnace work on your temp line, then the easiest fix is to run a permanent line either directly from the battery (with a separate fuse) or from the fuse box - whichever is easier.
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