engine won't turn over at all

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"I have an 08 mason dump with a 10 cylinder gas engine. It won't start . Battery seems ok, Lights don't dim. I put the body up and down. When I turn the key it doesn't crank over at all, I haven't started the truck in a month. It's very clean, 30,000 miles" The D and R indicators on the shiter indicator glow all the time