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Battery drain, what a pain
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Shade Tree
New User
Oct 16, 2007, 7:59 PM
Post #1 of 3
(1632 views)
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Battery drain, what a pain
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Been working on this one for a week or so. 92 S-10 Blazer, battery died 3 months ago, everything fine with a new one, then it went dead again recently. Charged it up, next day after work it's dead again. Jumped it & went straight to chain auto parts store where I bought the battery. Thay tested it, not charged enough to load test, but alternator only doing 8 amps (85 normal). Replaced that, no improvement. Began to trace wiring, found a short from the alternator battery terminal to alt casing - 105 k ohms, enough to throw a small spark when connecting wire. This isn't normal, right? I also get 12V between positive battery post and and disconnected pos cable (with alt disconnected) - figured that was the always hot lead to my stereo or something small since it doesn't even register on my DC ammeter. I'm guessing my new alternator is grounded, but want some confirmation before I try to return it. Thanks in advance for your help!
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 17, 2007, 2:15 AM
Post #2 of 3
(1626 views)
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Re: Battery drain, what a pain
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The noted drain is the problem and likely within the alt itself. Double check that everything is off in the vehicle - some sneaky things are glove box lights, cargo/trunk - things like that and even delay interior lights must stay off when checking. Don't forget the hood light too. Always best to charge batteries with a charger and not the alternator when possible. A battery can kill the alt and vs versa so both need to be good at the same time, T
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way2old
Veteran
/ Moderator
Oct 17, 2007, 4:43 AM
Post #3 of 3
(1622 views)
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Re: Battery drain, what a pain
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You can not detect a current draw by ohms or volts. If you disconnect the battery and place the meter in series on the volt scale, you had better be getting battery voltage. This is because all the battery grounds are connected and you are completing a circuit. You need to do the same test with amperage. A current draw as small as a tenth(.10A)of an amp can run the battery down in a few days. So use the current function on a meter and csee how much current you are drawing. Being way2old is why I need help from younger minds
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