[amc49]

If you're talking about the connector at each independent fan motor, one is power and the other ground. If you're talking about the connector to the main shroud itself, one wire goes to resistor in shroud top center and then both fans for low speed. That's the normal fan circuit turned off and on by temp sensor. The other wire bypasses the resistor, it has power when A/C is on for high speed to both motors. Those two wires are spliced together somewhere in shroud wiring after the resistor so that both fans can go low speed or high speed at the same time, based on which relay (high or low) is activated. That's on '00 model.