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Old 05-10-2018, 11:09 AM   #2 (permalink)
Stubby79
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Join Date: Sep 2012
Location: Victoria, BC
Posts: 1,747

Firefly EV - '98 Pontiac Firefly EV
90 day: 107.65 mpg (US)

Little Boy Blue - '05 Toyota Echo
90 day: 33.35 mpg (US)

BlueZ - '19 Nissan 370Z Sport
90 day: 17.19 mpg (US)
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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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