To do this you need an accurate voltmeter. The answer depends on if you,,,,,,,,,, only have a cutout relay,,,,,,,,,,,,if the Voltage Regulator (if so equipped) has Voltage and Current control relays or a combination Voltage/Current control relay,,,,,,,,,,if its a 2 or 3 brush generator.
Sure it may be possible if correctly done to adjust spring tension or bend tabs to do what you are asking, but its just NOT something Id try to describe over the net with so many unknowns even though many others may be willing to do so.
I have seen some simple cutout relay systems work fine WITH NO ADJUSTMENS being made but I cant say what genny or VR or cutout or whatever it is you have, I'm sorry.
FWIW a few days ago Bob posted a link to a Delco publication that may or may not help (depends on your genny and VR or cutout). I have several Delco manuals in my library but don't have the URL links like Bob posted where you can go get them.
Sorry no more help, others with pictures or manuals or instructions to MATCH YOUR SYSTEM will hopefully chime in
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