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. This is on my 97 F150 XLT 4x4 with electronic shift.

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. I had the motor off the TC to see if it spins the rod that actually moves it in to the selected position.
-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. It just clicks click clicks clicks when you select 4H. Light does not come on and the clicking just keeps going till you select out of 4H.


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,

 

Go here for wiring for your truck www.ebscohost.com User: greatfalls Pass:publiclibrary Select auto repair, year, make, ect.

Haven't touched one of these in 20 years, bear with me, remove electric motor, can transfer case be put into all three positions manually. (Just to verify TC is OK)? If it works properly, then its all electrical.

 

yes you can move it manually. The TC motor when removed but plugged in and the selection is made for 4H it does not move the arm. For 2H and 4L it does though.

tonight I looked at the vacum lines and noticed something strange and this might be my cause. There are 2 vacum hoses going from the front end light blue and red or orange that go behind the battery. There is also a black rubber hose (larger) that is plugged into the front end that runs along the vacum hoses....does that black hose lead to somewhere or is that just a breather hose? I was looking at it and it seemed to be cut, again that is if it's not a breather hose. Just seemed odd.

 

Try to clog the spot that is broke and see if that changes anything. If that doesnt do anything then you might try to have someone go into the computer with a scanner and go into the transfer case and clear out any codes. I dont know if this is the problem but mine was doing weird stuff and I used the scanner where i work and found codes in the transfer case that were not in the regular codes. After i did that it fixed it. It sounds like you have more of a mechanical or electrical problem but if you can get it scanned its worth a try.

 

Bill where do you go to log into ebscohost I couldnt find it.