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Old 05-03-2010, 05:04 PM
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Why won't my battery stay charged?

Ok so I can't seem to figure this one out.If I let my car sit for a few weeks without starting it,the battery will be dead when I go to start it.I have new battery new alternator new mini high torque starter can't seem to find a draw.I disconnected the negative battery cable from the post&stuck a test lite between the post&cable&nothing.Any ideas?

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Old 05-03-2010, 05:45 PM
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You will want to remove the positive + cable and take the reading between those two points .. cable and positive + battery post... test light or meter same same ... removing the ground opens the circuit ....
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Old 05-03-2010, 05:50 PM
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Quote:
Originally Posted by pepi
You will want to remove the positive + cable and take the reading between those two points .. cable and positive + battery post... test light or meter same same ... removing the ground opens the circuit ....
Either cable will show the same results. If there is a draw it is equal on both the ground and positive cable. It is actually safer to do it on the ground cable.

To the original poster, have the battery tested, just because its new doesnt meen its good, especially if you are sure there is no draw. A wrap around current probe is a better tool. When you disconnect the battery you could be releasing whatever circuit is drawing
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Old 05-03-2010, 06:03 PM
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Any idea how else to check for the draw?
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Old 05-03-2010, 06:37 PM
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Using a multimeter, preferably a digital type, (if you don't have one, borrow one from a friend), disconnect a battery cable. It makes no difference which one, since the current thru the positive battery post and the negative battery post are equal. Set the multimeter up for measuring current, and touch the meter leads between the battery post, and whichever cable you disconnected. If there is any current draw, you'll see it on the multimeter. Then by process of elimination, you can pin it down. As a precaution, many digital multimeters have a current measurement function that's limited to 10 amps. If you somehow exceed that value, you will probably blow a fuse in the multimeter. If that happens, the multimeter will indicate zero amperes. Just avoid turning on any high current circuits while you're checking things out and you should be OK.
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