Hi, I have a 1999 Jimmy SLT. When I put it into 4x4 the lights on the buttons light up as they are supposed to and I can hear the actuator moving. In other words everything seems normal on the surface. However, there is no power being delivered to the front wheels. Is this a problem with the 4x4 module?

Is vacuum being applied to the actuator under the battery tray when you shift to 4WD?
If so, does the actuator pull the cable at least 1/2"?