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HOW TO Wire 12V LED Rocker Switch – Simple Guide and Wiring Explanation

Marine Rocker Switches

Wiring a 12V LED rocker switch is straightforward, but it’s essential to understand the basics to ensure proper functionality and safety. Here’s a simple guide to help you wire a 12V LED rocker switch.

Tools and Materials Needed:

  • 12V LED rocker switch
  • 12V power source (e.g., car battery)
  • Electrical wires
  • Wire stripper/crimper
  • Connectors (e.g., spade connectors)
  • Multimeter (optional for checking connections)
  • Electrical tape or heat shrink tubing

Steps to Wire a 12V LED Rocker Switch:

Understanding the Switch Terminals:

A typical 12V LED rocker switch has three terminals:

  1. Power Input (Power, Load, or Supply): Connects to the 12V power source.
  2. Accessory Output (Load): Connects to the device you want to control (e.g., light, fan).
  3. Ground (Earth): Connects to the ground.

Wiring Process:

  1. Identify the Terminals:
    • Check the switch for terminal markings or refer to the switch diagram/manual.
    • The terminals are often labeled as Power (P), Load (L), and Ground (G).
  2. Prepare the Wires:
    • Cut the wires to the required length.
    • Strip about 1/4 inch (6mm) of insulation from the ends of the wires.
  3. Connect the Power Source:
    • Connect one wire from the 12V power source (positive terminal) to the Power Input terminal on the switch.
    • Use a spade connector to ensure a secure connection.
    • For safety, you can install an inline fuse between the power source and the switch.
  4. Connect the Load (Accessory):
    • Connect one wire from the Load terminal on the switch to the positive terminal of the device you want to control.
    • Ensure the connection is secure using a spade connector.
  5. Ground Connection:
    • Connect a wire from the Ground terminal on the switch to a suitable grounding point.
    • The grounding point can be the negative terminal of the power source or a metal part of the vehicle chassis.
  6. Connect the Device Ground:
    • Connect a wire from the negative terminal of the device to the ground (same grounding point as the switch ground).
  7. Test the Connections:
    • Once all connections are made, test the switch by turning it on and off to ensure the LED lights up and the device operates correctly.
    • Use a multimeter to check the voltage and continuity if necessary.
  8. Secure the Connections:
    • After verifying the connections, use electrical tape or heat shrink tubing to insulate any exposed wires or connectors.
    • Secure the wires in place to prevent them from moving or coming loose.

Example Wiring Diagram:

V1D1-B60B ON-OFF Rocker Switch. SPST with Independent Lamp (V1D1-G66B) DPDT Rocker Switch (VJD1-D66B) DPDT with Independent Lamps (VJD2-U__B) DPDT Momentary (VLD1-A_0B) DPDT Momentary with Mixed Lamps (VMDJ-G66B)


  • Always disconnect the power source before making any connections to prevent accidental short circuits or shocks.
  • Double-check the terminal connections to ensure they match the switch’s diagram or labels.
  • If the switch has an LED indicator, it should light up when the switch is turned on, indicating the circuit is complete.

By following these steps, you can wire a 12V LED rocker switch correctly and safely. If you have any specific questions or encounter issues, feel free to ask for further assistance.

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