4x4 dont working on my 95 1500 dodge - Dodge Cars & Trucks

First check fluid level in transfer case (under the vehicle). Check manual for fluid type and exact recommended level.
Second > Drive in reverse s-l-o-w for about 30 feet. Shift to "drive" and go forward about the same 30+ feet. Now attempt to go into 4X4 mode. If not a malfunctioning solenoid, the above should do the trick.