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Old 05-28-2011, 10:57 AM   #1
2nd Gear Member
Join Date: Jul 2009
Location: toronto
Posts: 165
Battery issue and voltage fluctuation

Today I had a battery drain issue again.

It heppens once in every month.

Yes I drove more than an hour before this drain.

I did the leakage test and the voltimeter shows 30mA/h which is perfectly normal.

I did the full load test. I started the engine and turned on every possible electronic related. HID, fogs, full A/C, both driver and passenger heated seat, rear window heated, Audio on with full bass, DICE was connected and charging my iphone.

Now it shows 11-12V with engine on. Meaning that my battery won't get charged when I am driving if I were to use all those accessaries. Shouldn't it have to show around 14v even with full accessaries on??

This is the only possible explanation why my battery gets drained every month.

When nothing was on then my battery shows 14V.

What could be the trouble? Alternator? or Voltage regulator?

I replaced my battery 3 months ago and it worked pretty good so I don't think my battery is the problem.

Thanks for your time guys.

here is the youtube video
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Old 05-28-2011, 02:59 PM   #2
Dr. Flyview
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Join Date: May 2006
Location: Toronto
Posts: 4,401
Is it fluctuating like that under electrical load and stable 13-14V otherwise? What if your alternator just isn't good enough to run all that stuff? Do you regularly use all that before seeing a drain?

1998 BMW 328is - summer
1992 Ford E250 Sportsmobile - daily
1993 BMW 525i - sold
1994 BMW 325i - sold
1992 BMW 325i - gone
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