1989 S-10 4X4 front problem(please help)

I had the vacuum switch go bad on my truck. I put a new switch & now my actuator works, but my front end does not engage.I took off the shift cable housing. Then I operated the shift shaft by hand & I can feel & hear clicking in the front end. My thoughts are that the shift fork in the front end is broken. I would sure appreciate any & all feedback. Thank You very much.

Have you checked the front end is actaully not working, or are you going by the indictator light? I mean a defective switch or a burnt out bulb would be where i would look first, before tearing into the front diff on a hunch. look for the simple stuff first, but be ready to face the worst.

pull the actuator out of the axle tube and make sure it is pushing out

dumb question did it work before you repalced the switch

I pulled the actuator cable off of the axle tube & operated the shift shaft with a pair of vice grips. When I pulled the shift shaft out, which is supposed to engage the front end, the front end will make a clicking sound and feel like it is trying to engage. When you look at a parts break down, the only thing I see that it could possibly be is the shift fork. I have never been inside this style of front end before. I would like to thank everyone for their response.