Battery drained, again - Team Camaro Tech
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post #1 of 49 (permalink) Old Oct 6th, 09, 07:35 AM Thread Starter
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Battery drained, again

OK, thought I had this figured out. My ammeter shows nothing draining the battery, charging system checking out. I had cleaned up the connections and my current draw went from 2.6 amps to 4 mA, thought this was a great improvement. My clock does run fast so I decided to put it on a switch although the power to the clock took about a minute before it stopped after turning switch off, even when I snipped the orange wire it took awhile before the clock stopped. Ammeter read 0 at that point.
Took the car for a ride the other day and after sitting for 2 days tried to start it yesterday and the battery was dead. WTF? I am probably going to install a battery tender but it would be nice to know what is draining my battery. Any ideas where to start guys?
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post #2 of 49 (permalink) Old Oct 6th, 09, 07:59 AM
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Re: Battery drained, again

Bad battery itself if you are getting no drain?

Years ago I read a tip in a magazine that if the battery itself was dirty, it could be a path to ground to discharge the battery over time.

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post #3 of 49 (permalink) Old Oct 6th, 09, 08:19 AM
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Re: Battery drained, again

Dirty as in the top of the battery dirty.
What is the charge on the battery after it sits for 30 minutes from a run?
If you install a test light between the post and cable, does it glow?

Normal working for a '60's clock.

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post #4 of 49 (permalink) Old Oct 6th, 09, 08:55 AM Thread Starter
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Re: Battery drained, again

It's a brand new battery and the top is clean. The negative cable connection at the post I did notice was warm after running the engine for a short period. Checked voltage drop from post to wire and there was none, so assume terminal connection is ok.
I'll have to check the voltage after 30 minutes and try the test light as well.
I'm going away for a week so I'll be doing it when I get back.
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post #5 of 49 (permalink) Old Oct 6th, 09, 04:25 PM
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Re: Battery drained, again

Good luck on the trip.

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post #6 of 49 (permalink) Old Oct 17th, 09, 01:16 PM Thread Starter
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Re: Battery drained, again

started car up and took for a spin. disconnected battery, hooked up ammeter and shows no draw (0.00 mA), hooked up test light and did not light up, opened door to make sure and light lit. Voltage check at 13.24V, just checked it after 2 hours and it's down to 13.15V. I don't think the battery should drain at all if it was good and less than a month old. What do you guys think?
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post #7 of 49 (permalink) Old Oct 17th, 09, 01:30 PM
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Re: Battery drained, again

bad NEW battery!
its happened before!
specifically the autozone or advance auto batteries.
if they drop the battery itll short internally.


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post #8 of 49 (permalink) Old Oct 17th, 09, 01:39 PM Thread Starter
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Re: Battery drained, again

It's a walmart battery, guess I'll be bringing it back
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post #9 of 49 (permalink) Old Oct 17th, 09, 01:39 PM
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Re: Battery drained, again

Surface charge from the drive. Check voltage later in the evening, should be 12.6 volts showing a fully charged battery.

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post #10 of 49 (permalink) Old Oct 18th, 09, 05:57 AM Thread Starter
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Re: Battery drained, again

It's 13.1 volts this morning, just connected it back up and will monitor today. Does this sound like a bad battery?
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post #11 of 49 (permalink) Old Oct 18th, 09, 07:10 AM
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Re: Battery drained, again

On bad cell can do it...trade it back and try again.

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post #12 of 49 (permalink) Old Oct 18th, 09, 07:11 AM Thread Starter
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Re: Battery drained, again

Battery connected and went from 13.1 to 12.8 in an hour, ammeter syas no draw, test light doesn't light; going to bring battery back and try again as you say. thanks
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post #13 of 49 (permalink) Old Oct 18th, 09, 07:56 AM
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Re: Battery drained, again

try and stay away from the chains like walmart autozone etc.
if you go to NAPA youll get a good battery.
you get what ya pay for hold true!


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post #14 of 49 (permalink) Old Oct 18th, 09, 08:30 AM
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Re: Battery drained, again

Quote:
Originally Posted by rjg67rs View Post
Battery connected and went from 13.1 to 12.8 in an hour, ammeter syas no draw, test light doesn't light; going to bring battery back and try again as you say. thanks
During this one hour test, was the DMM connected to the battery all of the hour?

If it was, this is the reason why the volts went from 13.1 to 12.8, the DMM is providing a current path for the battery while measuring.

I think the battery is good. Let the store check it and let them tell you whether their product is good. The store probably will, but have them put a 100 amp load meter on it and check to make sure the voltage does not go below 10 volts for 15 seconds.

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post #15 of 49 (permalink) Old Oct 18th, 09, 08:36 AM
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Re: Battery drained, again

I chased a battery drain for a while, turned out to be the voltage regulator. There is a way to test that, but don't remember what it is. I think you take a test light and touch one end to the alternator plug, and one to a ground on the car (anywhere where you can get a good ground) and if it lights up, you have a bad regulator. Don't quote me on this, but I found this tip on TC. I replaced the regulator, and have not had a single battery related issue since.

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