Battery blowing voltage regulators "why"

BillGrissom said

Was your Vreg the old mechanical type (always state the car model and year)? I wouldn't think the later electronic Vreg (triangle connector) would be damaged by even 16 V input. Perhaps if the field control wire shorted to 12 V it could be damaged. If so, that might happen within the connector.

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Like Bill is eluding too, there are 3 voltage regulators. The points type, The I think 70 and down retrofit one for electronic ignition and the 71-up stock(I think).

What year is your car or is it retrofitting to electronic ignition? We need to know more.

Tee points type will blow if used on electronic ignition converted cars. It physically wont interchange with factory electronic ignition cars.