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08-03-2020, 11:01 PM | #1 |
Second Lieutenant
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Drives: 2007 BMW Z4 3.0si; 2010 BMW X6
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Location: Palm Desert, CA USA
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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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2007 BMW Z4 3.0si - Hellrot
2010 BMW X6 M - Space Grey Last edited by 1er_vert; 08-04-2020 at 08:42 PM.. |
08-06-2020, 10:24 AM | #2 |
First Lieutenant
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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 |
Second Lieutenant
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Drives: 2007 BMW Z4 3.0si; 2010 BMW X6
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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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08-17-2020, 10:41 PM | #5 |
Second Lieutenant
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Drives: 2007 BMW Z4 3.0si; 2010 BMW X6
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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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2007 BMW Z4 3.0si - Hellrot
2010 BMW X6 M - Space Grey |
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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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'10 BMW X5///M - Alpine White on Sakhir Orange - JB4 w/ HCP Stage 2 BEF, NGK 97506 @ .20, SS tubing & BMC filters, gutted cats, AC Forged 312 22's, H&R 2"
'98 BMW 740iL - ///E39 M5 6spd swap, fully built engine (sleeved, P&P, cams), 3.46 LSD, H&R Stage 2/Bilstein HD, Magnaflow 14816's '97 BMW 328ci - ///E36 M3 clutch & L/W flywheel, Z4///M 18's |
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