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    2006 GMC savana 3500 ext 6.6 duramax cold start

    Plugged in at night, still won't start in morning. 12 degrees this morning..no crank no start. Yesterday 17 degrees started fine. Glow plugs just replaced (ac delco) last week. Batteries are good. i have had it at the dealership last year for the same issue and they are stumped. Hoping someone...