Installing the Ring Pro Power Kit with your Existing Doorbell Connect the wire harness to the Kit. Disconnect your bell's "Front" wire. Look for Wires labeled "Front" and "Transformer." Use the wire clips to connect the "Front" Wire to the black wire on the the Wire Harness. Information : Wire Harness Automated Manufacturing System Bell Helicopter Textron, Inc. (BHTI) began development of an automated wire harness manufacturing system during the mid 1970s. Wire Harness Automated Manufacturing System (WHAMS) was initially implemented in 1981.