Im having trouble locking my center diff. Shifting to 4lo- don’t hear any clicking or buzzing. Shorted the sensor switch and my abs/central diff light went on. 30 amp fuse seems intact. Driving and playing with 4lo around does not seem to help either. My next suspicion is the relay? Unless it’s super faint, im not hearing any clicking or unusual sound when shifting to 4lo. Where is this magical relay? Tried searching but could not find a definite answer. Just located in the kick panel? Hope its just the reay, would hate to remove the actuator