Only thing now is the light doesn't come on.

 

Need to check and see if you are getting vacuum at the actuator on the front axle.

Take the connector off the front axle, start the engine, and verify you have vacuum at one of the lines.

Next, shift the truck into four wheel drive, you should now have vaccum at the OTHER line for the actuator. If you have vacuum at one, but, it doesn't switch when you engage four wheel drive, there is either a problem with the line, or, the switch in the t-case isn't working.

Have a look, see what you find, take it from there.