Have no Idea why it drains the battery?

MS SARA

MEMBER
2006 HYUNDAI SONATA

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

Tuesday, May 5th, 2009 AT 9:45 PM

1 Reply

SQM

MECHANIC
6,383 POSTS

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.

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Tuesday, September 21st, 2021 AT 10:44 AM