I was sitting in my Jeepster jamming to some tunes from the radio with the key in the "on" position, engine not running. The alternator light was on and I noticed that it was pulsing, sort of like when you have the turn signal on with the engine not running. I thought it might be the radio causing it and turned it off. Pulsing continued with no accesories running. I did a 80 amp one wire alternator upgrade about a year ago and have had no problems. I find this quirk puzzling though. Any ideas anybody?