I noticed that my "Service 4WD" light on the dashboard never goes on and off when I start my Blazer. Should it turn on and off when I start the truck like it is doing a system check with the other lights? I read the manual and it does not mention if that specific light should do that.

 

nope, it's a light that isnt wired up in our trucks.

 

so basically it's there, but isn't wired up to work? thats so strange.