Battery issue and voltage fluctuation

alpine86 · 05-28-2011, 11:57 AM

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

http://youtu.be/RMnvQK8iODY

Dr. Flyview · 05-28-2011, 03:59 PM

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?