What is the manufacturer name on your "Battery Control Center" (BCC). On Gasser RV's it is usually under the hood but on diesel RVs it can be somewhere in the back of the RV.
I know a company called "Custom RV Products" manufactures many of them for RV's. If it is Custom RV Products you can contact them and they can email you a schematic and troubleshooting information.
They helped me with my chassis disconnect. I jumpered my chassis disconnect relay out and do not plan to replace it. Here is my post.
Hurricane Battery Disconnect
06 Hurricane 34FT WH W20 Chassis 8.1L 120K, 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