Battery drains overnight

Tiny
DAN BALDWIN
  • MEMBER
  • 2004 CHEVROLET CAVALIER
  • 90,000 MILES
I pulled the negative terminal and tested for a draw. There's a 11.9volt draw and I'm not sure what's causing it.
Monday, December 3rd, 2012 AT 9:32 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
We need to take a step back and check the amperage that the vehicle is using when the key is off, and all the doors are shut.

I understand that people check the voltage, but this is not definitive enough to tell us if we have an ignition off draw that is draining the battery.

Here is a guide that will help with common issues that cause this:

https://youtu.be/z5F7WpgjaRs

Basically, once we know what the amperage is, we will have a better idea what to do but it is over 35 milliamps (.035 amps) then we need to start pulling fuses until we drop below this number.

Just make sure you flip the latch or close the door switch so that the lamps don't stay on.

I am attaching the info below on how to set the meter up so let's start with this and we can go from there.

Thanks
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Sunday, February 20th, 2022 AT 6:03 PM

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