Autozone has some wiring diagrams. You have to use a chevy truck with a 7.4l engine. Then they don,t have much for 1998 or 99 but do for 2000 and newer.
| Repair Guides | Power Distribution (2000) | Power Distribution (2000) | AutoZone.com
You might find what you need. Good luck.
06 Hurricane 34FT WH W20 Chassis 8.1L 129K, Steersafe, Koni Shocks, DIY Trac Bar, Tri-Metric 2025RV Battery Monitor, 4-6V Batteries, Scan Gauge 2, Crossfires, 735W Solar Morningstar MPPT-60, KVH R5 In-Motion Sat, XM Radio, 07 Chevy Malibu Maxx Toad, Falcon 2, Brake Buddy, Escapee