Hello my name is XXXXX XXXXX I will be more than happy to assist you.
Is the fuse you keep blowing the ATC 20 Amp Fuse?
Does the fuse blow as soon as you put a new one in, does it blow when you try to put the vehicle inXXXXX or just blow randomly?
Go to the instrument fuse box and remove the 4WD 10 apm fuse.
No replace the ATC 20 Amp fuse and turn the ignition on, see if the ATC fuse Blows again, and let me know.
Next step will be to unplug the Encoder Motor on the tranfer case, put both fuse back in, and see if the ATC fuse blows.
You either have a bad Transfer Case Control Module or a short in the wiring from the Transfer Case Control Module to the Transfer Case Encoder Motor.
If you have a test light or volt meter I can tell you what wire to test.
If you don't then you will need to start from the Tranfer Case Encoder Motor connector and follow the Black, Red and, Tan wires back to the Transfer Case Control Module to see if you can find a short to ground in the wires.
Go to the Transfer Case Control Module located on the passenger side behind the kick panel and unhook it.
Now connect the test light to battery positive and touch the test light to the Black, Red, and Tan wires at the Transfer Case Encoder Motor connector.
Does the test light light up at any of the wires?
Transfer Case Control Module location
Sorry for the delay.
Some time the wire diagrams may say one color but it is not always correct. As long at you had the connector disconnected at the Transfer Case Control Module, the wire that lit up the test light is the wire you will want to follow.
All test are done with the Transfer Case Control module and Encoder motor unplugged.
Which connection do you have at the Encoder motor?
Does you encoder motor have a harness like the one in the picture below?
Let's make sure we are on the same page. There are three different types of Transfer Cases GM uses on that vehicle and the wire diagrams in gm manual I think are mixed up. In the picture below is the encoder motor. It might no look the exact same as your but at least gives you what we are looking for.
See how many connectors go to it and how many wire to each connector. If possible can you tell me what color the wires are in each connector?
Leave that connector at the Encoder Motor unplugged and plug the Transfer case Control Module back in. Put both fuse back in and see if the ATC fuse blows again.
Keep the Transfer Case Control Module plugged in, now plug the Encoder Motor back in and see if the fuse blows.
Either when messing with the wires the bad wire is not gounding out any more or the encoder motor is no shorting out.
Try and shift the Transfer Case to see if the fuse will blow.