I have an 02 Trailblazer....I was fixing one issue (for which I needed to disconnect the battery) when I finished up and reconnected the battery, my Service 4WD light came on and stayed on...it worked just fine before that! When I start the car, the lights come on above the switch, but after that, nothing! Every once in awhile the red "N" is lit up...very weird. Can anyone tell me where I might start?!