09,3500

Truck wouldn't start at store last week. Replaced both batteries, still wouldn't start. Smacked the starter and it started. So I replaced the starter Sunday night. Has worked GREAT for four days! Fired up beautifully a hour and half ago! Now I'm stranded at the DMV cause I came back out and it won't crank. Just a click. Banged starter, still nothing but a click. Five day old batteries and starter- where do I go from here other than crazy!?!?