[whited44]

FWIW, this is a Richard hack when working on unknown circuitry.

First I would get to good wiring on both sides of the burned and chewed stuff. Then I make jumpers with a blade fuse holder in the jumper. Any automotive store will have the blade fuse holders. A 5 or 10 amp blade fuse will protect the circuits from a direct short.

So to clarify.  Put blade fuses on the burned and chewed wires??  I have the blade fuse holders already in my tool box in the coach