I've had a similar problem as mijobo2000 with the battery indicator. At first I thought it was electrical interference at a construction site since it only seemed to happen when I was passing through that area. It started happening more often so I swapped the 9 year old OEM battery for a new Bosch replacement. That didn't solve the problem so I installed new battery cables and a new Bosch alternator (generator). The indicator light still goes on and off. I've noticed it happens more at higher speeds or when it's hot.