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To wrap this post up: Dealer determined that the damaged harness had shorted against the front drive shaft, and blew the #66 fuse on the bottom of the fuse box. I checked this fuse but it did not appear blown, when I inspected the fuse when I picked the truck up it was nearly impossible to tell...

2019

Going to get it right now!

Where do you get all of this information from? I can never seem to find any technical manuals or anything?

That would make a lot of sense considering this is the wiring harness running to that connector: Somebody smart decided to route it around the front driveshaft.

Oh ok then that is a great option thank you!

Does the differential not lock the front wheels together?

If your talking about the one on the bottom of the fuse box in the engine compartment then yes I have checked the fuse listed as 4wd/fuse 66

Will definitely look into this, my trim tools are in a storage unit 30 minutes away though so that's not great.

I have been meaning to get a code reader for this exact reason but I do not have one on hand unfortunately. I am starting to thing the 4x4 control module might have failed somehow.

I did indeed unplug the connector which of course threw a check powertrain light. Inspected the plug connections and everything and put it back together and still no change.

So engaged 4x4 yesterday morning everything functioned fine and then the 4x4 system decided to just shut off I guess. Dial selector has no lights/no functionality. Truck is stuck in 4 high. Checked all fuses, connections, etc. No check engine/service lights. The only thing wrong that I found was...