Why would you switch from a generator to an alternator and not go 12V conversion instead? Don't now what 6V AC Delco you are talking about, please give a link. No matter what you buy, you are going to get get a AC Delco or rebuilt AC Delco, modified standard 10si.
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Some of these vendors may be taking
This and adding
this. Your cost to do it....$54
I advise going 12V conversion. Easy to do, cheaper/more available components. See the "Tip Section" on here.
