Re: Very odd problem
14.8v is a little high but not uncommon. Check the ground for the voltage regulator and make sure it is clean.
I'd be tempted to replace the battery if you're having problems with corrosion on the posts and excessive venting, but if the ground cable is corroding make sure you clean that up really well and apply silicone grease or battery terminal grease to the posts and cable ends to help prevent future problems.
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