4wd fuse blowing (SOLVED)

[fairway605]

Hey everyone, started my 2005 Silverado with 30K miles that has the push button 4wd and got the service 4wd message right away. Wasn’t using 4wd or have used it for a while.So for the heck of it I checked the fuse in the driver side dash fuse panel and it was blown. I replaced the fuse and as soon as I started the truck it blew again. The lights on the 4wd switch are all working. Appreciate any ideas or help where to start trouble shooting. Thanks 

After more research the 4wd fuse in the driver side dash fuse panel is only for the front axle actuator. The plan was to pull the connector off the actuator start the truck, if the fuse blows when disconnected problem is in the wires. If it dos not blow then its the actuator and thats what happened. When I disconnected the connector I noticed it had moisture in it and thought thats not good, so I blew all the moisture out plugged it back in started truck, Service 4wd message gone fuse not blown. Problem found moisture.

[davester]

That fuse is for the main part of the system, namely for powering the encoder on the transfer case (TC), the sensors on the TC, and the actuator in the front axle.  You probably need to get under the truck to see if a wiring harness has rubbed through or one of the electrical parts has failed.