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Battery drain or Alternator issue

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Old Sep 1, 2025 | 09:16 PM
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Battery drain or Alternator issue

Hi guys, need some advice. I just purchased new batteries two weeks ago and today my starter battery died and needed a jumpstart. This happened after driving the car. When parked overnight with the tender plugged in it starts perfectly. Then when I drive for a few minutes and turn it off, it doesn’t start back up and needs to be jump started. Once it is jump started it stays on. I dont have any battery lights on the dash and all electronics are working fine, no dimming or anything. What can it possibly be? Not sure if this has anything to do with it too but my ac no longer blows cold even after a refill.
 
Old Sep 4, 2025 | 01:29 PM
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Have you run any diagnostics? You have a battery management module (address 71 Battery Charger) which controls charge to each battery. Mine was fried and the starter battery wouldn’t charge as a result. Have a look at my thread:

https://www.6speedonline.com/forums/...es-sorted.html
 
Old Sep 4, 2025 | 02:23 PM
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I did, the only code I have is p0243, the car was sitting outside a shop for really long. After I picked it up I noticed a few things went out possibly due to rain. My fuel filler cap motor stopped working, my window driver main switch stopped working. Third brake light stopped working. Speaker’s sounded blown. I’m going to try to replace that part you are referring you.
 
Old Sep 13, 2025 | 07:06 PM
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Changed the battery management module

Originally Posted by DanW12
Have you run any diagnostics? You have a battery management module (address 71 Battery Charger) which controls charge to each battery. Mine was fried and the starter battery wouldn’t charge as a result. Have a look at my thread:

https://www.6speedonline.com/forums/...es-sorted.html

so I removed the battery control module and there was a lot of corrosion on the connectors and module. Also I heard a rattle in the old module. I cleaned the corrosion on the connectors and put the new module in and it still has the same issue.


 
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