If you can't find a good replacement wiring , maybe it's a option to replace the burned wires for new quality ones into the bulkhead connector or solder and heat crimp new wires onto the existing spades in the connector.
If you find a used wiring harness you also don't know what you get!
Another option would be to get a new universal complete wiring harness from eBay or other supplier.
Jeep "because mother nature hates flat roads to"
99' Dodge ram 2500 4x4 crew cab 5.9 Cummins ,backup work truck for now
73' Jeep J4000 (named Heep or Desert Dragon) amc 360 V8 converted to LPG with T15/D20 (was my daily work truck for thirteen years and is getting major overhaul at the moment!)
80' Jeep cj5 350 V8 Chevy/sm420/D300 project
70/71 Jeep J4000 parts truck with Buick 350
85' Volkswagen caddy mk1 1.6 diesel.
83 Toyota land cruiser BJ42 3.4 diesel.