Ok I posted on here and a few of you said to test some thing before posting again so here is what i got and where I need input.

My 4x4 High will no engage with selecting 4H with the electronic shifter. 2H and 4L will. I replaced the switch removed the TC motor to see if it actually is moving it. It does not. When you select 4H the relays clicks under the oval by the passenger side.

things I did:
-replaced the stock TC motor and it did the same so I took that back and put the stocker back on.
-replaced the electronic switch, still doing the same thing.

-bench tested the switch to make sure it's not bad either. I get the specified ohm resistance reading for 2H,4H,4L as I was told to check.

-I moved the relays around under the oval to determine witch one is for the electronic shift, but they all made the clicking sound.


questions I have:
-Does the GEM see anything after the switch has it's selection made or does it go the Relay and then to the TC motor?
-how do I test he signal after it leaves the switch?
-hint on how I can check at the relay to see if the GEM is sending the right amount of voltage.
-what pins can I check on the wiring harnes on the TC motor to see if there is anything going to the TC motor. I would assume no voltage since it's not moving when a selection is made.
-it was mentioned there was a relay behind the dash, guidance on how to get to it the easiest would be appreciated too.


thanks for any help. I'm really hoping to get this fixed this week since the snow is coming.

Thanks,