Testing the actuator the way you described, if i hit the 4hi button inside the truck, would the 4hi button actually quit blinking and say it is locked into 4hi (if the acutator is functioning properly)? I have tested both the old and new actuator and neither of them seem to be working. Is it going to be very obivous when they are moving in and out?
There are no check engine or service 4wd lights present on my truck. i can hear the noice you described coming from the center of the vehicle but the front differential does nothing. I also want to add that this truck has only 50k miles.
i just had my vehicle scanned. there were no fault codes and the transfer case is working properly. The front differential is not locking in like it is supposed to.
i think it said something like:
Front differential locked? (y/n) It was a NO
the mechanic i talked with was a gm mechanic and he seemed to think broken wire or relay.
We even tried unhooking the battery to reset the computer.
Do you have any input on this?