I have a 2003 6.0 Liter. The other day i got in it ann tried to start it up. The starter was dragging like the batterys were low. So i plugged it in and let it charge all day Saturday and Saturday night. I got in it Sunday and it was doing the same thing. So i took the batterys out and had them tested. They were perfect. So i took the starter off and had it tested, it was also perfect. I am at a loss for words here.. Can anyone help?