RECEIVER BOARD INSTALLATION PART #8-5002-GEM The receiver board is provided with & 24” long color-coded harness Tor interconnection of the receiver board: with the motor control boded of the operator, 1 Black Wire: 24 VAC/DC Positive power supply connection and cotton tithe control relays, 20 White Wire: | 24VAC/DC Negative power supply connection. 3. Red Wire: | Normally open Relay output to Down direction: 4; Yellow Wire: Normally pane Relay output to Up direction. 5.