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I would question to a certain extent a knowledgeable tech who immediately replaces a $100 part when a car comes in "with problems". Not trying to be snarky but yeeesh people.
Anyways, what I would do first is yank out the voltage regulator to look for worn out brushes. At that point, if one or both are worn down, you would probably be better served replacing the regulator. Other course of action is to get the battery charged up and take it someplace to get the charging system checked. This is what the next step would be if the brushes look good. back when I was a tech the first step was to check the charging system and if it was low output (less than 13.8 or so) check the brushes. A poor mans way of testing would be to check batt voltage with the engine running, again it should be 13.8 to 14.4v when running. To be fair make sure the major electrical consumers are off, AC and blower fan, headlights, etc. The charging system or battery makes way more sense than a the OVP given the symptoms.
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