Four-wheel drive will not engage?

My four-wheel drive will not engage. The transfer case does not lock in and the front axle actuator does not lock in. The ATC fuse is good and so is the 4 x 4 fuse. I have already replaced the switch twice, because I have known new parts to be no good at times. The indicator lights do not come on at all, even for two wheel drive or neutral and I have no service 4 x 4 light coming on on the dash either. I have cleaned the ground on the frame underneath the driver's door and the ground from the firewall to the engine block. I am beginning to think the module itself is bad, but I would prefer not to just throw expensive parts at this.
I would even settle for a way to rig up four-wheel drive high with toggle switches if it were possible. Can anybody help?