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· Premium Member
28,957 Posts
Does this car sit a lot without being driven for extended periods of time?

If so, get a battery maintainer/tender.

Check to see if you have an oil leak on the alternator, common issue that can cause problems.

Check any ground wires that may have been taken off at some point.

Also where are you checking the charging Voltage? Given the battery is in the trunk, there are a lot of connections that can be an issue.
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