On my 1990 2500 Suburban has been sitting more than driving due to gas prices and not realy needing it. Anyhow I went to move it a few days ago. I started it right up, released the parking brake in order to move it. I noticed the idicator light (for the parking brake) went from bright to dim and will not go out completly. The pedal is fully released. The truck shows NO effects of a dragging brake not fully releasing. I believe it's electrical but where to look?