There is a transfer case switch located on the top left of the unit I would start there. Here is the wiring diagrams for the transfer case.
If the front differential actuator shorts out on these trucks. Try unplugging the 2 wire plug that goes to the front diff actuator and see if the fuse still blows, if it does not then you know the actuator is no good.
Check out the diagrams (Below)
Please let us know what you find. We are interested to see what it is.
Images (Click to enlarge)
Wednesday, October 31st, 2018 AT 6:28 PM