Relay Harness: MotoCycle Single Output (H4) fits_2015-2018`BMW`M3`Base~2015-2020`BMW`M4`Base~2019-2020`BMW`M4`CS~2016`BMW`M4`GTS year-1966-make-pontiac-make-pontiac-make-pontiac

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adjustable linking system featuring expandable widths

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Relay Harness: MotoCycle Single Output (H4) fits_2015-2018`BMW`M3`Base~2015-2020`BMW`M4`Base~2019-2020`BMW`M4`CS~2016`BMW`M4`GTS year-1966-make-pontiac-make-pontiac-make-pontiacPower Delivery: The MotoCycle relay harness is designed to deliver steady voltage to your HID system directly from the bike's battery. Factory headlight outputs are really only designed to power a halogen light bulb and with the not so stable electrical systems on motorcycles that could mean bad news for the longevity of your upgraded headlights without a harness. One of a Kind: The Morimoto H4 Single Lamp Motorcycle specific harness is the first and