07 Tahoe Service 4x4 Help

[Joe Kniat]

My 4x4 quit working and the service 4x4 message popped. Lost communication with transfer case. I took it to the dealer and they found corrosion on the 4x4 fuse terminal under the hood in the fuse block. they cleaned it and it worked great for a week and now its back. I pulled the fuse and I don't see any corrosion. Now when its been raining or really moist outside it will work and it will stay on as long as I leave the Tahoe running. When the weather dries out the service 4x4 light is back on. HELP!!!!!