I have 98 gmc 1500 4wd with floor shift. The truck has 3 wire plug on harness for transfer case on top of transfer case , the transfer case will engage.The person before me swapped in different trans case with 2 prong trans case switch on top of transfer case.Can anyone tell me how to connect wires from 1 black, 2 grey wires on original harness to 2 wire switch? I bought new switch and wire connector? I tested it to see if it worked with original style and 3 wire switch and it works so i know it is functional. Any help would be greatly appreciated. Thanks ,eric