Automotive Lighting System Wiring Diagram with Circuit Groups

Detailed wiring diagram illustrating a complete automotive lighting system, including headlights, taillights, DRL, and brake light circuits. Features comprehensive wire gauges, fuse ratings, bulb wattages, and dedicated ground points for each circuit group. Includes color-coded wiring and Layout-specific amperage specifications for easy troubleshooting and installation.

graph LR
    B[Battery 12V] -->|Red 10AWG| MF[Main Fuse 80A]
    MF -->|Protected Power| F[Fuse Box]
    
    subgraph Headlight Circuit
        F -->|15A Fuse Red| LS[Light Switch]
        LS -->|Yellow 16AWG| HR[High Beam Relay]
        LS -->|Yellow 16AWG| LR[Low Beam Relay]
        HR -->|White 14AWG| HB[High Beam 55W]
        LR -->|White 14AWG| LB[Low Beam 55W]
        HS[High Beam Switch] -->|Blue Wire| HR
    end
    
    subgraph Taillight Circuit
        F -->|10A Fuse Red| LS
        LS -->|Brown 16AWG| TL[Taillights 5W]
        LS -->|Brown 16AWG| ML[Marker Lights 3W]
        LS -->|Brown 16AWG| LP[License Plate Light 5W]
    end
    
    subgraph DRL Circuit
        F -->|7.5A Fuse Red| DM[DRL Module]
        DM -->|Gray 16AWG| DRL[Daytime Running Lights 35W]
        LS -->|Input Signal| DM
    end
    
    subgraph Brake Light Circuit
        F -->|15A Fuse Red| BP[Brake Pedal Switch]
        BP -->|Red/Black 14AWG| BL[Brake Lights 21W]
        BP -->|Red/Black 14AWG| CHMSL[Center High Mount Stop Lamp 21W]
    end
    
    B -.->|Ground Black| G[Ground Points]
    HB -.->|Ground Black| G
    LB -.->|Ground Black| G
    TL -.->|Ground Black| G
    BL -.->|Ground Black| G
    DRL -.->|Ground Black| G
    
    style B fill:#ff9999,stroke:#333,stroke-width:2px
    style F fill:#99ff99,stroke:#333,stroke-width:2px
    style LS fill:#9999ff,stroke:#333,stroke-width:2px
    style HR fill:#ffcc99,stroke:#333,stroke-width:2px
    style LR fill:#ffcc99,stroke:#333,stroke-width:2px
    style DM fill:#cc99ff,stroke:#333,stroke-width:2px
    style G fill:#cccccc,stroke:#333,stroke-width:2px

About This Diagram

This wiring diagram provides a detailed view of the automotive lighting system wiring diagram with circuit groups. Use this diagram for troubleshooting electrical issues, understanding system connections, and performing maintenance on your vehicle's electrical systems.