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I have a 2009 Buick Lacrosse. Since Dec 2018 I have gone through 3 batteries, and on my 4th one. I go to start the car, and there is no voltage. The battery is completely dead, and may have only been sitting idle for 1 hour. I try to charge the battery, and my charger indicates a “bad battery”. I take to the auto parts store where I bought it, and they confirm that the battery is dead, and can’t be charged. They give me a replacement one because it’s still under warranty. I took it to the dealership and explained this in detail, and all they did was a parasite voltage drain test. I told them that this was a “draining” issue, but one of something causing the battery to completely fail. What can I do to try to figure out what is going on?
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Were it mine , I would start out by doing the following ;
Get a volt / ohm / amp meter . Cheap one is ~ $10 at Harbor Freight .
Visually inspect as much of the wiring as you can see .
Have the alternator inspected / check it yourself . May have one or more bad diodes .
If it has a cigarette lighter , unplug it . Any USB charger plugged into the cigarette ?
Make sure the trunk & under hood lights go out when they are closed & not burning 24/7 . Make sure the interior lites go out when the doors are shut .
Any aftermarket accessories connected to the electrical system ( trailer brake controller stereo head end ) .
Remove the negative cable from the battery with a full charge on the battery . Measure the voltage and amperage drain ( key off & and out of the ignition ) between the negative battery post and the negative battery cable . Write this down and record the data .
With the VOA meter connected slowly remove fuses one at a time , watching and recording the data for both volts and amps . Does the removal of any one fuse produce noticeable change ?
Report back with what you find .
God bless
Wyr -
PS Check the serpentine belt and pulley .
God bless
Wyr
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