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12v battery charge doesn't work in car - Cars & Trucks

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Joel Friedenberg

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A few reasons why the charger is not charging the battery: The charger itself is not working; The battery will not take a charge, the battery can be 'dead'. If you can, connect the charger to another battery, just to see if it is working. The charge indicator needle will move. If you have confirmed that the charger is working, then the battery may be beyond charging. Make sure the connections from the charger to the battery terminals are tight.

Posted on Jun 11, 2014

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2012 Chevy volt service high voltage system 12 volt battery keeps dying.I took it to dealership and they think it's the hybrid battery for 12000 dollars to replace does that sound right.
First is to determine if there is a spurious current leak from the 12 v system. measure the current out of it with a good meter and turn everything off if not already. Start pulling fuses until the source is found and trace that circuit for the issue. The 12V charges from the high volt system if its anything like out Toyota Hybrid. And if it were the HV battery, then charging the 12V one so that you could start should expose a HV battery that shows significant drain from sitting. Does it? Did they verify the inverter (Charges the 12V) is working properly? Think of it as an alternator for hybrids.

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One thing bad about the HCH2, is that the 12V battery controls the electronics, and the Hybrid battery charges the 12V battery. However the 12V battery is not charged all the time, and cannot be charged when the IMA is usually being used, and in different scenarios. (Buy a Electronic volt meter which plugs into the 12V adapter $14 Walmart))

It is possible that the 12V battery is being drained while driving and caused a voltage drop which can cause your problem. In your case, I would change the 12V battery anyway as they do not last long on Hybrids. (You may have to get Honda to trip the IMA warning lights.) In my case, changing the 12v battery helped the hybrid battery as it was the electronics reporting the charge level wrong.

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