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I have a 2003 2500HD Silverado...the 4 wheel drive won't engage. I do not have auto 4wd. when I press the button to switch to 4wd, the light just blinks and then returns to a solid light on 2wd. I can here a click after I press the button, but I cannot hear the shift motor running. My question is, is there a way to decipher whether my problem is the shift actuator, or the shift motor. I think it is the shift motor, but not sure Thanks in advance any help is appreciated.