1994 CHEVROLET 4X4 NOT WORKING

The problem is on the front carrier /meatball this it ware it shifts into 4x4. Its a vacuum system that pulls a cable depending how yours works manual or electric it dose the same thing pulls the gear to lock the front wheels .It can be removed easily with no oil loss you likely need to reattach the paper clip that holds it all together I'M not kidding .

Switch has high failure rate. If that's the one mounted on the left side of the instrument panel.

It is either the switch is going bad, the actuator is bad, or you are loosing power to the actuator. The way to find out is to remove the pan under the front end, and unplug the actuator. Use a volt/ohms meter to test the leads to it in order to make sure it has power & ground. A test light can be used in place of a meter if you don't have one. Make sure the harness is clean & making a good connection, then test to see if it powers up when the switch on the dash is pressed. If it does in fact power up, then replace the actuator. This is more than likely the problem, and you can get a new one from most any parts store for about $60+. The light on the dash will only light up if it engages the actuator. You can listen to it with the engine off, ignition switch on, and have a buddy push the switch on the dash. You should hear it make a sound as they push the button from one to the other. This is in fact the easy way to tell (usually) if its the switch, or the actuator.

Try this,on the front axle there is an actuator for the 4x4,unplug it and try to engage 4x4 with it unplugged,if the fuse doesn't blow,actuator is bad.
Also look at the wires going to the actuator they get damaged from brush and things.

there is a actuator either vacume or electric thats prob it

Check the front axel control soliniode, it's on the right side of the front axel.

sounds like the transfer case is in need of rebuilding! or the front drive axels have grounded off teeth in the front diff, but I suspect the first one.

you should have your 4 wheel actuator checked

Check the fuse to the 4x4, if the fuse is good then check the 4x4 electric motor actuator on the transfer case. You should hear it work from 2wd, 4hi to 4low and back to 2wd with the push of the switch. if you don't hear it working then check the wire harness at the actuator motor, look for any damages like corrosion or cracked wire connector clips. If the 4x4 actuator is working on the transfer case, then the front hub 4x4 actuator may have gone bad and that's located on the front differential. It's common for the clip there to corrode and break and is an easy fix with a new collar pin, at worst it's the diaphragm on the vacuum actuator that is located under the battery tray. There is a vacuum switch on the top of the transfer case, driver side but when that fails, your front hub stay's locked in the on position. Good luck and keep me posted and hope it's a simple fuse that has gone bad. You can pick up all these parts at Auto Zone or Parts Source and they will have the step by step instructions for you to get the job done with common tools.

I have a 19934x4 bought it with 4 wheel drive notworking. indicator lights for 4x4 would notlight up but transfer seemed to be shiftin ok. frontaxel woul ot ingauge. I repled the front axel actuator an works fine now no problem. actuator is on the passenger sid back of the front axel pigand has a plug, mine was 2 wireroundpin plug but some have a flat pin 4 wire plug. 70 dollars at NAPA. wasa realy simple replacement didnt even need to jack up the truck. the actuator h a pin that electronically puses out engauging te front axel. a easy test is to put the truck in 4 wheel high. holdthe brak and givei little gas ad havesomeoneelse stand to the side ofthe front of the truck and see if the front axel spins. ifso th actutor is te most likely prblem. hope this helps.