If you intend to connect more than one pair of Flex Era Lights to a single switch, although we don't offer a specific wiring harness for this purpose, you can modify the wiring. Connect the Red load wires (Main light) by splicing them together and do the same for the White load wires (Backlight) beyond the relay for additional support. If you're using an auxiliary switch like a Spod/Switch Pro or a stock OEM switch, you can eliminate the relay and directly wire the Red load wires (Main light) together and the White load wires (Backlight) together. This eliminates the need for relays. For guidance on wiring to an OEM switch, refer to the provided videos; the process is similar for any auxiliary switch.