Overview The Opus OP4 electrical system follows Purple Line design, compliant with NFPA 1192, FMVSS 571, SAE J560, and SAE J1889. Wiring uses copper conductors insulated with T90 nylon 75 °C. Diagrams cover:
- 7-pin vehicle hookup and external trailer lighting
- Chassis breakaway and auxiliary charging runs
- Interior combined 12V DC and 110V AC circuits (solar controller, inverter, battery charger, compressor, fridge, pumps, lighting, heater pads, USB outlets)
Full high-resolution diagrams are in the OP4 Owner’s Manual on the Opus Owner Portal. Modifications must be performed by a certified RV technician to maintain warranty and safety compliance.
Key Diagram Summaries
7-Pin Hookup & External Trailer Lighting
- 7-pin flat connector pinout:
- Brown (BR 10 GA): Right turn + brake lights
- Red (R 10 GA): Left turn + brake lights
- Green (GR 14 GA): Tail/marker lights
- Yellow (Y 14 GA): Auxiliary 12V power/charging
- White (W 10 GA): Ground
- Black (BLK 14 GA): Brakes (breakaway circuit)
- Blue (BL 14 GA): Electric brakes
- External lights: Front markers (amber), side markers (amber), rear tail/turn/brake (red), license plate light.
- Breakaway switch interrupts brake power on disconnect.
- All wires routed through frame rails to 7-pin junction box and fixtures.
Interior 12V & 110V Combined Wiring
- Marine master switch isolates battery input.
- 12V circuits include:
- LED lighting (side kitchen, handle, front/rear map, toolbox, bed fans, L-room)
- Water pumps (WP1/WP2, 10 A)
- Fridge socket (15 A)
- Stereo (5 A), TV fan (1 A), toilet vent fan (1 A)
- USB outlets, compressor, dimmer, momentary switches
- Heater pads (AC heater switch feed)
- 110V AC circuits:
- Shore power inlet → transfer switch → battery charger → GFCI outlets (multiple 110V outlets)
- Inverter (where equipped) feeds select outlets
- Solar panels → 40 A controller → batteries
- Fuse/breaker ratings:
- Fridge socket: 15 A
- Water pumps: 10 A
- Lighting switches: 10 A
- Stereo/TV fan: 5 A
- Main battery input: 50 A (marine switch)
- Wire color legend:
- Black (BLK 10 GA): 110V live
- White (W 10 GA): Ground from battery
- Red (R 12 GA): 12V + from battery
- Blue (BL 12 GA light blue): Water pumps
- Yellow (Y 12 GA): Fridge socket + fan
- Green (GR 10 GA): Ground
- Brown (BR 12 GA pink): 12V outlet sockets
- Ground points: White/green wires to chassis.
Troubleshooting Tips
- No 12V: Check marine switch position, 50 A main fuse near batteries, breaker panel.
- No shore power: Confirm transfer switch, 30 A cord continuity, GFCI reset buttons.
- Specific circuit dead: Verify labeled fuse (e.g., pump failure → 10 A WP fuse).
- Voltage test: 12.6–14.4 V DC at batteries (charging or solar), 110–120 V AC at outlets when shore connected.
Safety Notes
- Disconnect shore power and battery negative before inspection or work.
- Annual certified RV technician inspection required for warranty compliance.
- All non-current-carrying metal must remain grounded.
