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Car Batteries

How do you determine what is drawing the battery down after you already changed the battery and alternator?


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Wiki User
2010-12-28 12:48:02
2010-12-28 12:48:02

Disconnect the negative cable and connect (insert) an ammeter between the battery and the battery cable. Remove the fuses one by one and see which causes the current draw to drop.

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Disconnect the cable from the alternator and see if that stops the draw. If it does, the alternator may be defective. Otherwise there may be something else drawing current.

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Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alternator belt. If the battery and alt test ok than check the connections to the alternator and battery. You may also have a battery drain (something that is staying on and killing the battery)

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I changed your battery?? I don't think so. I think your alternator is your problem!

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Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alternator belt. A replacement alternator can be bad. If it is ok than most likely a poor connection to the alternator.

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Disconnect the battery. Unplug the alternator and take the belts off. Unbolt the alternator, and bolt the new one in. Put the belts back on it. Plug it back in and reconnect the battery. Voila! You changed your own alternator!


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