[johnkosir]

It is not hard to get the fan working on 2 speeds, all you need is a normally closed and open 24 volt relay with the contacts rated at 2 to 3 times the fla of the fan motor, put the wire that is giving the fan power now on the common terminal I would put the high fan motor wire on the normally open contact  put the low fan wire on the normally closed contact. put the 24 volt common on 1 side of the coil put a wire from power side of the 2nd compressor to the other side of the coil,  that will switch it to high fan when the 2nd compressor turns on