My 4wd light just flashes forever and then says service 4wd. The tcase motor is working. When in 2wd the front drive shaft spins freely, when in 4wd I hear the tcase lock and the front driveshaft is locked in. Put in 4lo sane thing. TrNs goes to low gear, and acts likes it’s in 4wd but will still smoke the rear tires off. Have constant hot on rd wire at front diff Actuator. The other two besides ground are not hot when turning 4wd ****. Any help appreciated

09 ram 1500