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Old 03-28-2021, 02:38 PM   #1
Greasey Harley
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Join Date: May 2013
Location: Post Falls, ID
Posts: 884
alternators: 10si vs 12si wiring

I know this has been covered extensively however, I've have been looking and am still a little fuzzy.
I'm looking to upgrade from an externally regulated 10dn to an internally regulated unit.
Looks like 10si alternator can be installed with a jumper wire at the regulator and a plug swap at the alternator.

When I lookup 12si conversion:
Some claim you can install a 12si with the same simple mod.
Some say you need to cut into the harness.

...Or am I reading that wrong?
does a 12si wire up the same as a 10si?

I don't need more amps than a 10si will provide and I don't want to chop into my harness right now.
That being said, If I can install a 12si without rewiring, obviously I will.

Thanks,
-Russ
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Last edited by Greasey Harley; 03-28-2021 at 06:38 PM.
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