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Duramax Fourth Generation: 2007.5-2010 (LMM) Discuss the fourth generation (2007.5-2010) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 12-01-2019, 05:38 PM   #1 (permalink)
camper93
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Click, No Start (Another One)

So I have been having this issue for about a year now, thought it was batteries so I bought 2 new AC Delco batteries rated for my truck last year. All was good for a while and then started acting up again, took the truck to a GM dealer and after diagnostic they said it was the starter, so they replaced it about a month ago. Out shopping a couple of days ago the same thing happened, click but no start, got a boost and it started, went to the garage and had the batteries tested and all is good. I have checked the cables including the junction box on the fire wall and all seem fine (no corrosion). I have tested the alternator with my volt meter(14.6 volts when running). Any ideas would be greatly appreciated.
Thank you in advance.Ed

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Old 12-02-2019, 02:51 PM   #2 (permalink)
lmm2tow
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Have you checked the grounds? While I am new to the LMM world why past experiences always seem to point to a bad ground in these cases. Seems you should have a ground from each battery to the block.

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Old 12-02-2019, 09:39 PM   #3 (permalink)
camper93
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All the ground cables are clean and tight.
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Old Yesterday, 12:06 PM   #4 (permalink)
heymccall
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I seem to recall a rash of poorly crimped battery cables on the '07.5s and '08s. Thorough inspection of where the cables are crimped into the battery lugs is in order.
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Old Today, 07:40 AM   #5 (permalink)
camper93
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Ill have a look
Thanks
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