so this is what ive collected so far:
the 4wd system operates by positioning the shift lever in 4wh/4wl. from there, a sensor on the transfer case sends a signal to the actuators at the front axle, causing them to open/close thus engaging the front drive axles being spun my the already moving front drive shaft. then a sensor at the front axle sends a signal to the dash, illuminating the 4wd light. what i think has happened is the sensor at the transfer case has gone bad and wont send power to the actuators at the front axle. does anyone know where i can get a new one of these sensors? i was thinking of just bypassing it with a switch, but i'd really rather do it the right way.