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have a multi-meter ? please tell me what...

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Old Sep 12, 2011 | 08:41 PM
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Default have a multi-meter ? please tell me what...
your battery voltage measures in the morning before the car has been started. Mine reads 12.2 V and that seems like a low amount, but I have nothing to compare to.
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Old Sep 12, 2011 | 08:54 PM
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It is definitely low.
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Old Sep 12, 2011 | 09:30 PM
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If you are just measuring the voltage off the battery without it running...than 12.2 would be normal. Heck your battery could be half dead and still read 12.2volts on a multimeter. When using a multimeter there is no load so it takes nothing to display the voltage, but if you had a load on it then it you see if your battery was bad. That's why they have load testers for batteries, because there is no real way to tell if a battery is going bad off just a voltage reading. You should check the voltage while the vehicle is running at least you could see if its charging.
Last edited by A8nightmare; Sep 12, 2011 at 09:32 PM.
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Old Sep 13, 2011 | 04:08 PM
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Default Did all that....
Originally Posted by A8nightmare
If you are just measuring the voltage off the battery without it running...than 12.2 would be normal. Heck your battery could be half dead and still read 12.2volts on a multimeter. When using a multimeter there is no load so it takes nothing to display the voltage, but if you had a load on it then it you see if your battery was bad. That's why they have load testers for batteries, because there is no real way to tell if a battery is going bad off just a voltage reading. You should check the voltage while the vehicle is running at least you could see if its charging.
Prior to posting my question I took a multi-meter reading with the engine running...14V,so I know the alternator is charging. And had a load test performed on the battery...battery tested good (only a few months old).
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Old Sep 13, 2011 | 04:38 PM
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12.2V is still low. It should not go lower than 12.6V. Could it be that your multi-meter is not really accurate?
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Old Sep 14, 2011 | 12:53 PM
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Default so, tell me what's YOUR battery's voltage ...
Originally Posted by mishar
12.2V is still low. It should not go lower than 12.6V. Could it be that your multi-meter is not really accurate?
Are you saying that before starting in the morning your's actually reads 12.6V ?
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Old Sep 14, 2011 | 07:26 PM
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Yes. That's what led acid batteries theory says. I was lazy to do it this morning but I will measure it tomorrow. My battery is not new but I believe it is still good.
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Old Sep 15, 2011 | 01:23 PM
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Default took my multi-meter to an electric calibration shop...
Originally Posted by mishar
12.2V is still low. It should not go lower than 12.6V. Could it be that your multi-meter is not really accurate?
it reads 11.96V when connected to a calibration device that generates exactly 12V. So my meter is accurate for the purpose under discussion here.
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Old Sep 15, 2011 | 02:46 PM
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Checked mine and it is also 12.2V. I hope that theory is wrong.
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Old Sep 15, 2011 | 07:27 PM
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Default thanks for measuring for me...
Originally Posted by mishar
Checked mine and it is also 12.2V. I hope that theory is wrong.
12.2 defies theory and reasoning, but if another member reports in with 12.2 also I'd say ours are normal.
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