I am not getting power to the four wheel drive actuator on my 1993 Chevy K1500. What can I check?

Sounds like the problem that I had with my '94 chev sub k1500, twice!
The first time it was due to a blown fuse. Now I carry a spare 20A fuse when I go off-road.
The second time the electrically controlled/heated, fluid filled actuator mounted on the front diff failed. I now carry a spare actuator when I go off-road.
the actuator is powered when the switch on the top of the transmission is energized. I have had no problems with that switch, or the connecting wiring.

you probably need to put a new actuator in it

its most likely the Actuator in the front end not working... Its an easy fix... get it at autozone for like 100.00 bucks

on the top of the transfercase on the drivers side there is a vacuum operted switch check and replace if needed

There is a switch on the transfer case that likes to go out on these, they are about $15 or the front differential actuator is bad, the actuator is the round cylinder that is screwed in under the front diff, both very easy to change

First of all try checking your fuse box and make sure the 4X4 fuse is still good. If the fuse is good, move the shift lever for the 4X4 on the floor into 4 high, then get a friend to watch underneath when you move the vehicle a little bit to see if the front driveshaft is turning. If the front shaft going to your differential is turning the problem is probably the electric actuator on the differential.

have you changed the actuator on the front diverential. If so check and make sure you have power coming to the switch on the dash and out of it. Normally the actuator is what goes out on these and can be picked up a your local parts house for about $100.

Make sure that the vacuum actuator for the 4 wheel drive located on the axle is getting vacuum when its being engaged. A vacuum pump can be used to test the actuator for leaks. If no vacuum check line for breaks and if no breaks that you have feed vacuum for the switch itself

w9fro..In1995, and other model years, the actuator used to engage the transfer case into four wheel drive is oil filled with a heating element.
When you select four wheel drive the element heats up, the oil expands and engages the transfer case. Unfortunately if the actuator fails, the truck remains in four wheel drive. GM has an improved actuator so the problem does not repeat.
As always, check the basics, power, grounds and switch at floor select before replacing the actuator.
Also, if the truck is truly stuck in four wheel drive, you can tell by turning the truck in a tight circle. If the front end wants to "bunny hop" it is definitely engaged.
Best of luck, let me know.
Regards,

Is your 4x4 light coming on? Does the shifter move smoothly into position? I have a 95 that I have just about had every proplem imaginable. Need morre info. John.