have no idea why it drains the battery?

2006 HYUNDAI SONATA
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MS SARA
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2006 sonata, new battery changed after factory battery 3 years old, car would not start thought it was battery was checked and on the machines all ok , now its doing the same no light are left on on nothing have no idea why it drains the battery cant find a short had it at the dealers more than once seems to also blow the drivers running light x3 now have not idea
May 5, 2009 at 9:45 PM
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SQM
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Hello,

It sounds like there is excessive parasitic draw (current drain) to the battery.
Every electrical circuit with a battery will have some amount to parasitic draw, but when it becomes excessive it will drain the battery much faster.
The high parasitic draw can be triggered by a light staying on or a faulty circuit, like a shorted window switch etc.

A typical acceptable parasitic draw is around 50 milliamp.

Have a look at this video, it shows how to diagnose and find the parasitic draw:

https://youtu.be/z5F7WpgjaRs

https://www.2carpros.com/articles/car-battery-dead-overnight

Please let me know of any questions.
Thank you.
Sep 21, 2021 at 10:44 AM