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Open Roads Forum  >  Tow Vehicles

 > Mystery Battery Draw While Parked UPDATE

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N-Trouble

NorCal

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Posted: 01/16/22 01:01pm Link  |  Quote  |  Print  |  Notify Moderator

Have been dealing with similar problem on my 2012 Duramax. Every morning I get a weak start and batteries are ~12v. It doesnt matter if the truck sits one night or multiple nights it will not continue to drain. Its like it hits a cutoff voltage of around 12v and stops draining. Have replaced batteries and just last week the alternator. Problem is still there. I have not added any accessories to my truck. Its basically bone stock.


2015 Attitude 28SAG w/slide
2012 GMC 2500HD SLT Duramax
B&W Turnover w/Andersen Ultimate 5er hitch

Fisherman

Angus, Ontario, Canada

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Posted: 01/16/22 06:46pm Link  |  Quote  |  Print  |  Notify Moderator

Just a stab, I don't suppose any of you have one of those electronic anti rust devices. My neighbour had a 2011 GM and it would drain batteries after 3-4 days, once he found where it was attached and connected, he threw it far, far away, it was rusted worse than a 1990's ford.

patperry2766

Saginaw Texas

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Posted: 01/29/22 05:45am Link  |  Quote  |  Print  |  Notify Moderator

Had a similar problem on my 2013 F-150. If I disconnected the battery and reattached it after I turned off the truck, then everything was fine.

If I didn't then the battery would drain. Turned out that the ECM had to be replaced. It wasn't allowing the truck to shut down.


Courage is the feeling you have right before you fully understand the situation

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