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Old 08-14-2020, 08:49 AM   #27
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Join Date: Nov 2019
Location: Altamonte Springs FL
Posts: 449
Re: Stock alternator to 12 SI alternator

Originally Posted by tdangle View Post
Few months old thread, but exactly what I'm going to do shortly. Should the 12R wire be upgraded to a bigger gauge. I assume 12R stands for 12 gauge, Red. Is there anything special about the wiring to make the amp meter work? Per info I found it looks like 12 gauge will flow 41 amps. Enough for a stock 37 amp alternator.
Here'e a page that explains how to wire the amp gauge (and volt gauge).

As for the 12 gauge wire, I think that should be fine, but I'm no expert. I used 10 gauge, I wanted to err on the side of caution in case I add electric fans.
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1969 GMC Short Step Side
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