Service 4wd Warning light 2005 dakota

S10 you said clearly. NO BOX told at all, of 3 or more.
post that transfer case is there, ?
some are part ,time only for offroad only.
how to shift, steps (in dirt best)
keyoff, stop engine
key on shift to 4hi 4wd not 4 Low, 2speed version .
now start engine.
see if that works.?
got 3 switch NP1 box or NP233c box. (part time 4wd offroad only()
or 4 switch NP8 box, np236' is not full time !!! it too is part time.
not sure what box is there me, ever, only RPO and rear tag on box tells me what is there.
NP# is RPO code off your cars RPO list
Is the transfer box dry, the pumps love to wear a hole in the case and leaks dry, did it?
quote the 236 pages (wobble eats out case)

A problem associated with the NP236 transfer case is input and or output bearing wobble wearing out the case. The case material is magnesium which can build up heat in the unit causing failure of range fork and range hub, we recommend that these items be replaced during the rebuild cycle. The NP236 is also susceptible to problems caused by running the NP236 transfer case on hard surfaces like concrete or asphalt. Run 4WD only on loose dirt, snow, mud, sand or grass as the different wheel speeds in turns can put excessive torque loads on clutch, chain and sprockets.
join a real; GM forum , tell them your vin and this allows RPO to be pulled up and your transfer case, is now known, if still OEM stock.

I, feel sorry for you, after reading your problem, but don't worry you visit the Reliable-Store they will help you for sure. Best Manuals

Check the vacuum switch under the hood in the center of the firewall...follow vac diag

It can be faulty 4x4 wd switch.

4X4

On these issue, there are few solved help links for troubleshooting the issue easily.-------

Click the link below: ---

No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

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4X4 Truck makes roaring noise in the front end?

http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html

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Car will not go into 4WD high or 4WD low?

http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html

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No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

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4 wheel drive system will not disengage?

http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html

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4WD light is flashing and beeping? NO 4WD high?

http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html

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2002 Jeep Wrangler: 4WD Idiot Light is ON?

http://technoanswers.blogspot.in/2012/06/2002-jeep-wrangler-4wd-idiot-light-is.html

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Traction control switch will not engage on 4WD High or Low

http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html

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4WD light flashing and 4WD will engage after few minutes

http://repairhelpcenter.blogspot.com/2012/10/4wd-light-flashing-and-4wd-will-engage.html

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2008 Toyota Tundra: 4x4 Wheel Drive Light is Flashing?

http://technoanswers.blogspot.in/2012/05/2008-toyota-tundra-4x4-wheel-drive.html

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4x4 front differential will not engage the axle on ford?

http://technoanswers.blogspot.in/2012/02/4x4-front-differential-will-not-engage.html

-------

4x4 will not engage on Ford F150?

http://technoanswers.blogspot.in/2012/02/4x4-will-not-engage-on-ford-f150.html

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Dodge Ram 4x4 light keeps flashing

4X4 LOW LIGHT IS FLASHING ON DASH

http://technoanswers.blogspot.in/2012/09/dodge-ram-4x4-light-keeps-flashing.html

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Ford 4x4 front wheels will not engage?

http://technoanswers.blogspot.in/2012/02/ford-4x4-front-wheels-will-not-engage.html

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These details will help.

Thanks.

There are many vehicles which notice same issue with 4wd not engaging in low or high mode.I suggest you few help links related to these issue,with there troubleshooting details and solutions.
Car will not go into 4WD high or 4WD low? http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html

------------
No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

--------
4 wheel drive system will not disengage?

http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html

---------
4WD light is flashing and beeping? NO 4WD high?

http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html

-----------
2002 Jeep Wrangler: 4WD Idiot Light is ON?

http://technoanswers.blogspot.in/2012/06/2002-jeep-wrangler-4wd-idiot-light-is.html

-----------

Traction control switch will not engage on 4WD High or Low
http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html

--------------
Service 4wd warning light on Dash? http://howtobyme.blogspot.com/2011/11/service-4wd-warning-light-on-dash.html

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Car automatically switches to 4wd low?

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These are the help links related to your issue.Going through these help links,will guide you to troubleshoot and solve the issue noticed on your car.
Keep updated for more help.
Thanks.

Possible the vacuum bleed-off to the switch you installed isn't allowing it to completely disengage. Pull the bleed-off line from the new switch and see if it works. could be just a tight spot/bent closed in the bleed-off line or the vent plugged.

For troubleshooting these issue,Few related help links are provided below.Click the link below and go through its troubleshooting procedure:----Jeep 4WD Idiot Light is ON? http://technoanswers.blogspot.in/2012/06/2002-jeep-wrangler-4wd-idiot-light-is.html
------------
Service 4wd warning light on Dash? http://howtobyme.blogspot.com/2011/11/service-4wd-warning-light-on-dash.html
---------------Car automatically switches to 4wd low? ------------Car will not go into 4WD high or 4WD low? http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html
---------- No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

---------------
4 wheel drive system will not disengage?

http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html

------------
4WD light is flashing and beeping? NO 4WD high? http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html
----------------This will help.Thanks.

TCS And 4wd use the abs wheel sensors to engage and disengage so if there is a slight fault in the abs sensor system TCS will be disabled and the 4wd will either not engage or disengage depending on the drive position set at time of fault that is what the lights are telling you
Get the sensor system checked out from the abs rings on the axles to the sensors and wiring to the abs pump controller

The fuse number is

#16 - 5 Amp (Tan)

Gauges & Indicator Lights: Low Oil Light, Low Washer Light, Service Reminder Light, Transmission Oil Light, Brake Warning Light, Anti-Lock Brake Warning Light, Fuel Pacer Light, 4WD Indicator Light, Malfunction Indicator Light, Warning Buzzer, Overdrive Switch (1992-93); Transmission Oil Temperature Lamp, 4WD Lamp, Overdrive Module Seat Belt Warning Buzzer
(1994-95).

sounds like the seals are gone on the 4wd shaft, it takes oil pressure to keep the 4wd off, but if the seals are worn the all passes through and the 4wd will not dissingage, you will need a experianced michanic