This full wiring harness is designed to power a single or pair of D14 Destroyer headlights via two micro relays to pull all the current directly from the battery so you can run the max intensity Destroyer high beam without overloading your factory headlight circuit. The high and low trigger wires are terminated in a 4-pin delphi connector creating direct plug & play compatibility with Harley-Davidson Street Glide and Road Glide models. This harness is also designed to be used for all other universal & vehicle-specific applications when adding an simple adapter to the delphi end. Use our universal H4 adapter (DNL.WHS.26200) for plug-&-play connection to any motorcycle with an H4 headlight. For a fully universal installation to any bike, regardless of the headlight connector type, simply cut off the delphi connector and tap the green wire to vehicle high beam, the blue wire to vehicle low beam, and the black wire to ground.