99 Tahoe 4wd not engaging.....however.

[exp500]

OK, I could not download those files referenced in the above post. they showed to be infected.

You have to join GMT 400, Ive been using those for years and have had no viruses. Maybe a deep scan of your system is required? Good Luck.

 

[res02p35]

One thing to keep in mind an electrical circuit on a vehicle needs a good ground. just because there is power and even if the actuator works off of the vehicle increased resistance in the circuit might be a problem. Be sure to check all connections in the circuit.

Grounds have been checked, they are all good. When the actuator is plugged into the harness and installed I can feel it engaging when 4wd is selected.