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      05-12-2022, 06:52 PM   #1
qsaghar
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Drives: 2009 BMW 528i
Join Date: May 2022
Location: Orlando

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Question Low battery readings at underhood terminals

My 2009 BMW 528i has developed a peculiar problem. I can't charge the battery fully using the underhood terminals, and a battery test at those terminals show only 200 CCA from a 900 CCA battery + only 20% charge. However when I test the battery at the trunk terminals, tester readings show 901 CCA and 99% charge. Battery is fairly new, only about 4 months old. All the terminals look clean without any corrosion. I did not register the new battery when I installed it, but I don't think that non-registration would result in such drastically different readings. Can someone tell me if the underhood cables are a direct run from the battery in the trunk or do they go through some kind of junction box?
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