Model 6315: KC Hilites 6315 Relay Wiring Harness Kit allows for quick installation for up to two 130w lights. Harness complete with 40A relay, illuminated rocker switch kit, fuses and mounting hardware to handle up to 260w. Model 6308: The KC 6308 Wiring Harness with 2-Pin Deutsch Connectors is designed for two lights up to 55w each (Maximum 110w total). Weather proof sealed, including an Illuminated light switch. Relay not required. Model 6316: KC Hilites 6316 Add-On Wiring Harness features a relay for use in conjunction with KC #6315 Relay Harness Kit, allowing you to wire and operate two additional lights to power from one switch. Includes 40A relay without a switch.