This is going to be a dumb question, I realize. But I just bought an 01 Yukon, and the cluster was bad, so I replaced it. If I look carefully, I can see there is a "4WD" light on the cluster, but that does not light up when the vehicle is in 4wd (the little lights on the 4wd high/4wd low/2wd all work ok, and the 4wd is engaging properly). So my question is, should the "4WD" lamp on the cluster also illuminate when it is in 4wd? Or is that just a service light? I just need to know if my new cluster is performing normal or not.