need 4x4 help

ok i have a 1995 s10 blazer.. i have the elec dash push buttion witch i thik sucks. some times my switch wont even light up but some titmes it does. then when i press the four high button the light will light up and the drive shaft will lock for the four wheel drive but the fron axles wont lock in. it does the same thing in 4lo so if some one could help my why my switch wont lgiht up and why my front axle wont lock in.. thanks/

faulty switch

The switch not lighting up is mostlikely either a loose electrical connection at the switch or an intermittent connection in the switch itself.

With the front axle actuator, it is likely a problem with either the vacuum supply to the front axle engagement actuator  or the actuator itself.

thanks will let u know what goes on when i replace the switch