You are correct. The t-case unit is a stepper motor actually.
My t-case works but my selected light blinks and no sound from the front. I should be replacing my actuator in the next week hopefully.
Rapto use the diagram below and put a fused 12v on the light blu wire of the actuator and ground the black to test it.
I would like to add that
http://alldatadiy.com/about_alldata/index.html has a subscription for vehicle tech info major chains use it dealers use it and it cost less than $25 for the first year/vehicle. It contains very detailed info on everything the factory provide however while it will tell how to tear down a transmission for example with parts, fluid circuits and electrical diagrams it will not tell you how to change your oil. It's a lot of factory info.
I highly recomend it along witha haynes and chilton book. It is still cheaper than massive phone book sized manual set which I will get next year.
In the case of 4x4 there is over a dozen documents on diagnosis charts and theory of operation alone and they are all printable.
Mash, if you can provide a fax number I can send all the tech info I have printed so far on the 4x4 system include your attn: info for the cover sheet please. Rght now it would be easier this way.
As long as I have the time I will try to help everyone else. here is some examples:
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