Same with the black wire, the only other wires attached to the incoming power side of the contactor besides the hot wires would be an optional crankcase heater. There are a few different crankcase heaters but there would be a pair of small wires that stayed energized when the compressor isn't running going to the CC heater which can be a stainless steel band that wraps around the lower part of the compressor housing or a ceramic cartridge around an inch in diameter stuck into a well in the base of the compressor. ^_^