Re: alternators: 10si vs 12si wiring
I swapped a 12si in place of a 10si on my 75 C10. Drop in replacement. No changes needed. I did it because the 12si puts out a few more amps at idle speed and largely gets rid of the dim down effect when you stop while headlights, blower motor and wipers are all running. Like you, I didn't need the increased max output.
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