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03-28-2021, 02:38 PM | #1 |
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Join Date: May 2013
Location: Post Falls, ID
Posts: 896
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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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Insert clever text here: Last edited by Greasey Harley; 03-28-2021 at 06:38 PM. |
03-28-2021, 03:29 PM | #2 |
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Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,567
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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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04-03-2021, 09:57 PM | #3 |
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Join Date: May 2013
Location: Post Falls, ID
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Re: alternators: 10si vs 12si wiring
Decided to go with 63 amp 10si, it just looks correcter.
Guess I'm going to do a quick rewire while I'm in there too. I wanted to avoid opening up the wiring harness, but my CDO [properly alphabetized] won't let me leave jumper wires under the hood.
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04-05-2021, 03:32 PM | #4 | |
Msgt USAF Ret
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,715
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Re: alternators: 10si vs 12si wiring
Quote:
You should read my thread in the electrical forum stickies on frequently asked questions. It contains a lot of info on converting to internally regulated alternators. I think you are telling us you are OCD not CDO but I could be wrong. VV
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04-05-2021, 08:25 PM | #5 | |
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Join Date: May 2013
Location: Post Falls, ID
Posts: 896
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Re: alternators: 10si vs 12si wiring
Quote:
I got it done and am happy with the results. The wiring defiantly needed some attention.
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