How do I do a drain test?

Tiny
ANONYMOUS
  • MEMBER
  • 2006 MAZDA 3
  • 90,000 MILES
New battery drains checked alt ok! Starter turn so what is it? Gonna have fuses n wiring checked out mon.
Sunday, February 24th, 2013 AT 8:04 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

So just to clarify, the battery goes dead if you leave it overnight?
When the battery loses its charge in the morning you could have a voltage drain in the electrical system which is called a parasitic draw.

I have attached a step by step guide on how to find the parasitic draw and what to do to fit it.

https://www.2carpros.com/articles/car-battery-dead-overnight
https://www.2carpros.com/articles/car-battery-load-test
https://www.2carpros.com/articles/symptoms-of-a-bad-car-battery

You also might find this video helpful:

https://youtu.be/t4KNeFyORM0

Please let me know of any questions.

Thank you.
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Monday, July 19th, 2021 AT 11:29 AM

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