[GMC"ER]

Thanks guys, VetteVet I took a temporary jumper wire from the heater fuse and ran to the terminal that was on harness switch and bingo! the fan switch worked! I am going to look for that brown wire lost under the dash may have to take fuse panel off and look at the back and trace it down that way never know it may have been changed out over the years for a different color for some reason? If no wire is found I will just ran a fused link wire to the switch from the heater fuse in panel box I always like to put a in line fuse for safety. Thanks for the help guys, Robert