[olddog]

I think 13.5 volts is normal, but 14.2 volts is too high. I suspect your voltage regulator is not working properly. High amps and high voltage is two meters telling you that your battery is getting cooked.

If the regulator is in the alternator, you would need to replace it or take it to a shop that will repair it.

If the regulator is located separately somewhere, I would first verify it has a good ground. I unmounted my ECU and a bolt was mounting both the voltage regulator and the ECU. It turned out the voltage regulator was grounding to the ECU. My voltage went to about 14.5. I ran a new ground wire to the voltage regulator and voltage returned to normal.

PS
If the regulator is in the alternator, I suppose there could be a ground issue at the alternator, if it is relying on the mounting bolts.