Check, or have someone check, the voltage that the alternator is producing. No charge sounds like not enough voltage, possibly regulator, possibly brushes.

You need to measure, not just guess because OVP fuse blows. Sears, Sams, KMart can measure voltage for you if you don't have a meter.

Two dead batteries, unless boiled completely dry, sounds like no charge. They will not be at low voltage if overcharged, they will be at low voltage if undercharged

Low voltage will light up SRS, ABS and other warning lights like a Christmas tree.

Find out what's happening before battery #3 suffers a similar fate.

Best Regards,
Jim