Knapheide’s proprietary tail lights (used on Service, KUV and other bodies) have integrated strobe lighting as a standard feature. Activation and operation is a simple process: A power wire harness will need to be run from a toggle switch or OEM upfitter switch to the blunt-cut (Pink wire on the main Knapheide wire harness). This will control the power to the strobes. Once that is completed, strobe flash patterns can be selected by connecting the Purple and Pink wires together on the street-side of the wire harness, near the tail light. These Purple and Pink wires have slide-on terminals, so changing patterns is easy. The power wire harness is available for purchase through your area Knapheide distributor.