Wont go into 4wd

from a dealer or buy the repair manual from a local parts store or from Amazon.com

did you try the starter relay

You may have a bad selector motor on the transfer case, this is what moves it into 4wd or 2wd, start there test for power at the motor while pushing selector buttons.

check your transmission linkage

You have to be very careful working with cigarette lighter assemblies. The inner parts of the assembly can rotate without you realizing it, and this can bring the positive and negative portions of the assembly together. This can create a short circuit. Normally, the fuse will blow.

I would take the assembly back out and make certain that there is separation between the positive and negative sections of the assembly.

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silver button does not sound factory it maybe valey button for alarm, does it have or have alarm. 4wd is button actuated in middle of dash should be button with 2wd and button with 4wd, origional manuel free not that i know of. chilton manual for about $25 at part store give most general info and repair guide for fixing most things with diagnostic info

try putting in nuetral and then shift into high gear . if still does not work sounds like the 4x4 acctuator is bad

Most likely you have to replace or repair this motor.

http://www.am-autoparts.com/AM/Four-Wheel-Drive-Components/Mazda/Navajo/1991/

if you smell antifreeze ,and belive me youll know its antifreeze ,inside the car or the windshield will fog up when defrost is on ,you have bad heater core