DDM Tuning Universal HID Dual Relay Harness: 1 Year Warranty-FBA Dual Relay Heavy Duty Xenon Conversion HID Harness, 1 Year Warranty Designed to supply proper current and voltage to the HID system by using the stock wiring as a trigger for the relay. Plug and play use with all DDM HID kits (as well as most on the market). It's designed so both relays send power to both lights. What does this mean for you? If in the extremely unlikely even 1 relay fails, both lights will still function as normal and you won't be left in the dark. Power is drawn through TWO 40A relays to allow both ballasts direct power from the battery through a fused power wire. Wire length from relay: Power: 32 inch Ground: 7 inch (grounded at each output) Input / Output 1: 18 inch Input / Output 2: 68 inch