Thank you for your reply.As I said in my post I had the altinator checked by an altinator shop and they found nothing wrong with it. Late yesterday I pulled the battery out and replaced it. No flashing light and charging normal.I called my battery supplier and described the problem that I was having and asked if it was possible for a battery to cause such a problem. He said YES. He is going to bring his battery tester to my shop Monday and check it.Hopefully it is just something strange going on inside the battery because we have checked about everything else.