I would start by disconnecting all power from the coach including the batteries. Then trace the burnt wire. You are going to have to replace it anyway, don't wait on schematics.
If only a small section is burnt, look for a short at that location. You are probably going to have to repair a couple of wires if it melted into a bundle.
Report back where the wire goes, maybe someone with your coach can help.
06 Hurricane 34FT WH W20 Chassis 8.1L 132K, Steersafe, Koni Shocks, DIY Trac Bar, Tri-Metric 2025RV Battery Monitor, 4-6V Batteries, Scan Gauge 2, Crossfires, 735W Solar Morningstar MPPT-60, WG T4 In-Motion Sat, XM Radio, 07 Chevy Malibu Maxx Toad, Falcon 2, Brake Buddy, Escapee