If the belt stopped slipping (squealing) then you got it tight enough. How much did that improve the low voltage situation?
PS: Try a different DVOM. A fully charged 12V auto battery should read 12.6-12.8 VDC. Your measurement of 14.06 for a resting battery is way too high.
Your FLAPS should offer free testing of the charging system and battery, have you tried that?
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1985 744 gle d24t
1985 745 gle d24t
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