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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY. is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
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Old 05-15-2019, 09:36 AM   #11 (permalink)
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Originally Posted by APEXrtx View Post
Thanks for the reply. So, I'm pretty good with mechanical stuff but electrical I'm not so much... How would I check that? Is there an easy way to do it?

Most VOMs can measure up to 10 amps. I'm sure a small ma flow is normal. Seems like your problem will be an amp or more. Start with knowing the draw and troubleshoot from there.

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Old 05-15-2019, 11:48 AM   #12 (permalink)
Ron Nielson
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There are TONS of videos on Youtube showing you how to do this.

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Old 05-15-2019, 02:13 PM   #13 (permalink)
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First, I'd want each battery tested. Statistically, only one goes bad in a set.
When getting the replacements, have them tested before you leave the store.
As for deader than a doornail, I'd suspect your charger as well as the truck.

Buying over 50 batteries a year, @24 years, I've installed over a 1000 batteries, and only twice have I gotten a bad battery, and only once have I had one fail within a year.

As for the drawing them down, do you have any aftermarket electrical devices installed?
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Old 05-15-2019, 07:47 PM   #14 (permalink)
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yep,you really need to fully charge batterys with a real charger,

not a tender,
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Old 06-12-2019, 03:32 PM   #15 (permalink)
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Last fall I noticed I was having weird electrical issues. For example, clock was messed up and then sometimes my radio stations were blank. After some testing, I identified that one of my batteries were shorted. I replaced both batteries ($$$$$), the issue was resolved. Then later winter my alternate went out. I had my truck towed home so I could replace. There's an good chance your alternator when bad if you haven't checked.
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