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      08-03-2020, 11:01 PM   #1
1er_vert
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New AGM battery draining, after FRM replacement and registration WTH?

What is the usual culprits?

Heat? (It was 114F today)
Alternator?
Voltage regulator?
Intelligent Battery System?
USB charger?

I'm stumped...
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Last edited by 1er_vert; 08-04-2020 at 08:42 PM..
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      08-06-2020, 10:24 AM   #2
Colodano
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How much are you driving? These rigs pull a bunch of power for little stuff, and take a bit to charge, if you aren't doing at least a couple of longer drives a week, it isn't going to hold up.
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      08-10-2020, 11:13 PM   #3
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Fully charged, new AGM battery drops to 11.7v after cold start. It just slowly keeps dropping after a few miles, even with no accessories or running lights. I bet if I disconnect the negative lead the engine would quickly die. Ugh. Sounds like a new Alternator is needed.
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      08-11-2020, 05:36 PM   #4
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Yep, I think you have it nailed there.
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      08-17-2020, 10:41 PM   #5
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Alternator, Alright...

All good, now. Voltage is holding from 13.5-14.0 on AGM 95aH 950CCA battery.
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      09-02-2020, 11:01 PM   #6
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Battery coded after the swap? I was having voltage spike issues that would cause modules to freak out...TCS, ABS, parking, etc. Valeo lternators are like $900, new brushes are $7 on eBay so I replaced them myself.

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