![Aren't they all supposed to drop to zero when it isn't turned on? [4000x3000 - 655KB]](https://pic8.co/sh/ADyGHJ.jpg){kind=link}
I'd look into the onstar GPS antenna draining your battery, or possibly try getting a new alternator and battery
Bats only least few years now so upgrade to dry cell and you will have 10 good years easily even with accessories. Remove that OnStar bullshit. Be aan carry a jack and tools safety kit first aide parts blankets prep cunt
I don't use the OnStar. It's just some shit that came with it when it shipped brand new twenty years ago.
Chances are it's a weak battery. A proper load test done with a cheap $100 dollar scanner will tell you. Alternator should output in general 14.4v anything higher it's over charging and it if starts low 12.9-13.6 then goes up that's going bad slowly
The battery seems to work fine after an overnight trickle, and the alternator seems to be in good working order too. Battery's reading 12v after starting it up and running it for a bit. With the engine running I'm seeing the usual 14ish volts.
Edit: That's with the multimeter, not just looking at the dash.
Bat is weak if your trickle charging. Add water to the cells you'll get a bit longer out it but plates will collapse soon and you'll replace it
I only did trickle because I had a day to kill without having to run it. Might have been able to to it faster.
How fast is the drain? Do you have a voltmeter?
I just said I was using a multimeter. It checks volts, among other measurements.
Not sure how fast the drain is. It sat no more than two weeks between when I ran it last and it not turning over.
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