It doesn't put out it's rated output all the time, only if there's enough of a load on it. It tries to maintain a steady voltage, up to when it hits it's limit.
Your options are:
Reduce your electrical load as much as you can.
Replace the alt with a smaller alternator.
Rewind your alternator to reduce output.
Change the alternator pulley to potentially reduce output.
Trick your alt in to lowering it's output voltage.
Add some "fancy" current-limiting circuitry.
Remove the alternator altogether.
Or any combination of the above.
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