2005 Honda Accord 2.4l Automatic. I have a battery drain which started about 1 month ago. With a new battery fully charged it will drain in about 3 days. With a full battery the volt meter shows 10.91V between negative wire and negative post on battery. When unplugging the fuse under the hood(Backup ACC 40amp) the volt meter reduces to 1.92V.
I understand the 40amp fuse runs a cluster of smaller fuses but was unable to locate the single fuse that affects the 10.91V.
Would love any advise you may have.
Sincerely.
Wayne
You're testing it wrong. Look for amperage. There will be excess amperage when first connected because all the computer modules boot up first, then once they realize the car is off, eventually they go dormant... you give it five minutes or more before testing for current drain... have the windows rolled down and doors closed, key out so the car doesn't stay awake.
@hogdoctor
Tested for drain after 12 hours of sitting with no key in car, doors closed, windows up. I know there is a battery drain. Trying to find where the drain is at. The 40amp Backup ACC fuse is drawing power and this is not helpful as this runs the headlights, radio and accessaries. When checking the group of fuses(smaller fuses) I was unable to find the drain.
With a full battery the volt meter shows 10.91V
That's not a good sign. A full battery at rest , with the vehicle shut off, should have 12.7V
Go to a battery dealer and ask if they can test it for you. It should be a free service.
When unplugging the fuse ... the volt meter reduces to 1.92V.
that's very strange. The voltage across the battery terminals shouldn't change when you unplug a fuse.
@mountainmanjoe
The battery has 12.8V but when no power(no key in car for more than 30min) and removing the negative wire from battery pole the voltage is 10.9 between negative wire and negative battery pole. I assume this is showing the battery draw when car power is completely off.
As hogdoctor said, you need to measure current, not voltage.
https://www.youtube.com/watch?v=B__DqK90IIc