Wiring Multiple Sets of Lights to a Single Auxiliary Switch

Off-road enthusiasts often find the need to connect multiple sets of auxiliary lights to a single switch for streamlined control and enhanced functionality. While specific wiring harnesses for such configurations might not be readily available, the wiring process can be modified to achieve the desired setup. This article will guide you through the steps to wire multiple sets of lights to one auxiliary switch.

For this example, we will use KC's FLEX Era 4 lights.

Materials Needed:

- Flex Era Lights

- Splicing tools

- Electrical tape or heat shrink tubing

- Auxiliary switch (e.g., Spod/Switch Pro or a stock OEM switch)

Step-by-Step Guide:

1. Understand the Wiring Basics:

- Each set of Flex Era Lights has two primary wires: the Red load wire (Main light) and the White load wire (Backlight).

- When wiring multiple sets of lights, you'll need to connect the corresponding wires from each light set together.

2. Splicing the Wires:

- Red Load Wires (Main light): 

  - Identify the Red load wires from each set of Flex Era Lights.

  - Splice the Red load wires together beyond the relay point. This means you will combine the Red wires into a single connection that can then be connected to the auxiliary switch.

- White Load Wires (Backlight):

  - Similarly, locate the White load wires from each set of Flex Era Lights.

  - Splice the White load wires together beyond the relay point, creating a single connection for the auxiliary switch.

3. Eliminating the Relay (Optional):

- If you are using an advanced auxiliary switch system like a Spod/Switch Pro or a stock OEM switch, you can simplify the wiring by eliminating the relay.

- Directly wire the spliced Red load wires (Main light) to the switch.

- Do the same for the spliced White load wires (Backlight).

4. Connecting to the Auxiliary Switch:

- For Spod/Switch Pro or Similar Systems:

  - These systems are designed to handle multiple connections without the need for relays. Connect the combined Red load wire to the main light output terminal on the switch.

  - Connect the combined White load wire to the backlight output terminal on the switch.

- For OEM Switches:

  - The process is similar to aftermarket switches. Connect the combined Red and White wires to their respective terminals on the OEM switch.

  - Refer to specific OEM switch wiring videos for detailed guidance. The general principles of wiring remain consistent across different types of auxiliary switches.

Checking Load Ratings:

Before proceeding with the wiring, it is crucial to verify the load ratings of the auxiliary switch being used. Each switch has a maximum current rating it can safely handle, and connecting multiple lights may exceed this limit. Calculate the total current draw of all the connected lights and ensure it does not surpass the switch’s load rating. Overloading the switch can cause overheating, potential switch failure, and even pose a fire hazard. If the total load exceeds the switch's capacity, consider using relays to distribute the load or upgrading to a switch with a higher load rating.

Tips and Precautions:

- Splicing Technique: Ensure that all spliced connections are secure and insulated properly using electrical tape or heat shrink tubing to prevent any short circuits or exposure to the elements.

- Testing: After completing the wiring, test each light set individually and collectively to ensure that all connections are functioning correctly.

- Safety: Always disconnect the vehicle’s battery before working on electrical systems to prevent any accidental shorts or shocks.

By following these steps, you can successfully wire multiple sets of Flex Era Lights to a single auxiliary switch, achieving a clean and efficient lighting setup on your off-road vehicle. Whether using an advanced system like Spod/Switch Pro or a stock OEM switch, this guide ensures a straightforward and reliable installation process.