do you have a voltage meter?
a proper charging alternator / battery should have a voltage of 14 VDC. any thing over that would be the result of the alternator put out too much current
another nice to have tool would be an induction current indicator
https://www.amazon.com/GearWre...icator/dp/B000RH38GE
this just goes agaisnt the battery cable and shows how much current is going through
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