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

Quote:
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).

http://6066gmcguy.com/ammeter.html

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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