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To the op: Change your batteries,they are probably shot!I consider myself very lucky because our 07 dmax has original batteries,however I have to replace the batteries on my 06dmax every two years.....I'd bet the batteries are too weak to do the job,they are probably dropping in amperage as WELL as voltage upon trying to crank the truck.IIRC just the glow plugs take an initial 110 amp burst from the batteries on cold days..
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