No the defroster isn't running and neither is the AC. I just want to emphasize the the coach lights have always systematically dimmed - meaning dimmed and went back up, dimmed and went back up - when the engine ran, but now they are doing it in tandem with the click.
I will clean the battery teminals and check for loose connections. The noise didn't seem to be coming directly from the battery but some place close by. Very strange. I have started it 3 times today, and haven't heard it, but I am still worried.
