Both Headlights Popped

If the alternator is for some reason going over-voltage, you can usually "regulate" it by modulating the engine RPM. Start the car trying not to use too much RPM. Monitor voltage AT THE battery and gently bring up RPM. If it climbs much above 15--15.5 you have a big problem.

Alternatively, monitor right at the alternator stud. A wiring error.........or wiring failure..........might be allowing that terminal to go quite high even though the battery is somewhat "normal." If you have loads off that point, rather than at the battery, the loads will then "see" that higher voltage.

An example of this is a factory stock Mopar with the "usual damage" to the bulkhead terminals and or ammeter. The voltage drop between the alternator output terminal and the battery could be several volts. Some people advocate taking loads off the alternator output termninal, an example might be big driving lights. So if there is a problem in the harness, the alternator terminal will run quite high and supply those lights with too much voltage