Car DVR wiring diagram explained: ACC, B+, GRD. How to test the system without your car!

A 4-channel DVR (Digital Video Recorder) car wiring diagram typically involves connecting the DVR to the car's power supply, ground, and the cameras. Here’s a basic guide to wiring a 4-channel DVR in a car:

### Components:
1. **DVR Unit**: The main recording device.
2. **Cameras**: 4 cameras for a 4-channel system.
3. **Power Supply**: Typically connected to the car’s battery or ignition system.
4. **Ground (GRD)**: Connection to the car’s chassis for grounding.
5. **ACC (Accessory)**: A power source that is only active when the car’s ignition is on.

### Wiring Diagram Overview:

1. **Power Connections:**
- **B+ (Battery Positive)**: This wire should be connected directly to the car’s battery positive terminal or to a constant 12V power source. This ensures that the DVR has power even when the car is off, which is useful for parking mode.
- **ACC (Accessory)**: This wire should be connected to a switched 12V power source that only turns on when the ignition is on. This allows the DVR to turn on and off with the car.
- **GRD (Ground)**: This wire should be connected to the car’s chassis or a known good ground point. This completes the electrical circuit.

2. **Camera Connections:**
- Each camera will have a power wire (usually red), a ground wire (usually black), and a video signal wire (usually yellow).
- Connect the power wire of each camera to a 12V power source (can be the same B+ or a separate power source if needed).
- Connect the ground wire of each camera to the car’s chassis or a common ground point.
- Connect the video signal wire of each camera to the corresponding input on the DVR (e.g., CAM1, CAM2, CAM3, CAM4).

3. **DVR Connections:**
- **B+**: Connect to the car’s battery positive terminal or a constant 12V source.
- **ACC**: Connect to a switched 12V source (ignition).
- **GRD**: Connect to the car’s chassis or a ground point.
- **Camera Inputs**: Connect the video signal wires from each camera to the corresponding inputs on the DVR.

### Example Wiring Diagram:

```
Car Battery (+) ----(B+)---- DVR (B+)
Car Battery (-) ----(GRD)--- DVR (GRD)
Ignition (ACC) ----(ACC)---- DVR (ACC)

Camera 1:
Red (Power) ----(B+)---- 12V Source
Black (Ground) ----(GRD)--- Ground
Yellow (Video) ----(CAM1)--- DVR (CAM1)

Camera 2:
Red (Power) ----(B+)---- 12V Source
Black (Ground) ----(GRD)--- Ground
Yellow (Video) ----(CAM2)--- DVR (CAM2)

Camera 3:
Red (Power) ----(B+)---- 12V Source
Black (Ground) ----(GRD)--- Ground
Yellow (Video) ----(CAM3)--- DVR (CAM3)

Camera 4:
Red (Power) ----(B+)---- 12V Source
Black (Ground) ----(GRD)--- Ground
Yellow (Video) ----(CAM4)--- DVR (CAM4)
```

### Notes:
- **Fuse Protection**: It’s a good idea to add inline fuses to the B+ and ACC wires to protect the DVR and cameras from electrical faults.
- **Routing Wires**: Ensure that all wires are routed safely and securely, away from moving parts and heat sources.
- **Testing**: Before finalizing the installation, test all connections to ensure the DVR and cameras are functioning correctly.

This is a general guide, and the specific wiring may vary depending on the DVR and camera models you are using. Always refer to the manufacturer’s instructions for detailed wiring diagrams and specifications.

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