Depending on the severity of the burn, pretty much all of the existing electrical will be suspect, at best. It's also unlikely you'll have full access to every foot of existing wire harness for inspection and/or replacement.
You might consider just starting from scratch, running new wires for EVERYTHING. In that case whatever the factory did would be moot. You'll know what and where everything is and in the long run I think this would save hours of work and frustration.
Jay & Peggy Monroe with Dolly
Can't take it with you - don't plan on leaving any behind
2016 Newmar London Aire 4553, Spartan chassis
2020 Jeep Wrangler toad