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Battery drain - 2005 Mazda 3

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Drain is hard to find it could be a short or a component is staying on. you need an amp meter and hook it up between your battery negative terminal and the negative battery cable.turn the key off and check how many amp is the drain make sure all the lights and doors are closed, dont crank the car with amp meter on it will burn the meter. take each fuse out at a time which ever fuse drops the amps down by pulling it out is causing the drain. find what that fuse is for. check that component and the wiring on it for any shorts.

Posted on Dec 04, 2012

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Posted on Jan 02, 2017

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Electrical battery drain OR "parasitic drain"


Seen this "mystery drain" many times. Check spark at the battery to see how big the drain is. For this simple test, blow away any (explosive) battery charging fumes. Leave one terminal on and gently touch the other to its post in fairly dark surroundings. Then try it again with the wires taken off the alternator. Your spark is now probably much less. Usually bad diodes leaking electricity backwards through the alternator cause this drain. Replace the alternator or the diode pack inside it. Some mechanics recommend actually measuring the drain.... hahaha. OK whatever.

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My 98 lumina has a constant power draw from somewhere. I just replace the battery and had the alt tested (it was good). I have to jump the dang thing every morning but if I drive it enough during the day...


The alternator may charge fine but could drain the battery through a bad diode,have you checked the alt for a bad diode?Disconnect the battery positive cable.Put a regular 12v test light between the battery positive post and the positive battery cable.If the test light is bright you do have a drain,if dim it is OK.A dim light may mean the drain is internal in the battery.If you do have a bright light remove a fuse ,one at a time from the fuse box until the light goes dim.Once dim you have identified the bad circuit.If removing all fuses do not dim the light,disconnect the alt charging wire at the alt,if that dims the light,then you do have a bad diode.DO NOT create a drain(bright light) when checking for the drain by turning on the key or opening a door/trunk etc.
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