How much voltage is too much

MoparLeo said
What type of alternator are you running ? Factory or aftermarket. What does the battery test at when it is not running ? What are you using to measure running voltage ?

Factory alternator,battery is 12.5 volts,
I’m going by both gauges,factory and aftermarket and checked with a battery load test meter.
I was wondering if it’s high voltage blew out the coil?