Internally Regulated Alternator for a 66 with a L31 Swap options? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

msg · 12-19-2019, 08:35 PM

Im replacing the wiring harness in my 66 as part of the rebuild and also swapping my 350 out for an L31 vortec. The guy at American aAuto wire mentioned that I will need to replace my alternator with an Internally Regulated Alternator for the harness setup here.

https://www.summitracing.com/parts/aww-500560

I would like to keep with the v style pulley and reuse components from my 350. Anyone ever dealt with this an know what alternator I should buy?

**PGSigns** · 12-20-2019, 08:01 AM

I have an L31 in my 66 and have done the one wire setup. I'll see if I have it written down what one I used. It may have the part number tag on it, I'll look. You can change the pulley also on these. I used a long water pump, the factory left hand side alternator mounts and power steering setup all from a 1975 small block.
Jimmy

rpmerf · 12-20-2019, 08:26 AM

All kinds of info here on swapping to a 12SI (3 wire):
http://www.madelectrical.com/electri...elcoremy.shtml

There is a list of part numbers for different amperages and clocks. I converted my 70. Sill uses the V belt setup.

msg · 12-20-2019, 11:05 AM

thanks guys, I also called American Autowire and asked for a model year type that would work and since I have the L31 and will add AC he said that a 1980 Camaro would be fine for the v style pulleys with a long water pump.

I went to Rockauto and saw a few new AC Delcos and there were 2 listed
This one had a caution listed that I might need to change out the pulley...didnt understand why. Maybe it doesnt come with a pulley since I didnt see any pulley specs? Its $38 plus shipping.

https://www.rockauto.com/en/moreinfo...035289&jsn=545

Then there was this one that didnt have the caution and did have pulley specs for $80 plus shipping.

https://www.rockauto.com/en/moreinfo...sn=549&jsn=549

vince1 · 12-20-2019, 01:13 PM

I'd get a cs130 from an 89 Pontiac safari and get an adapter plug to hook the alternator up to the new harness.
https://www.rockauto.com/en/catalog/...generator,2412
https://www.hemmings.com/blog/articl...0-alternators/

12-19-2019, 08:35 PM	#1
msg Registered User Join Date: Feb 2013 Location: GA Posts: 1,315	Internally Regulated Alternator for a 66 with a L31 Swap options? Im replacing the wiring harness in my 66 as part of the rebuild and also swapping my 350 out for an L31 vortec. The guy at American aAuto wire mentioned that I will need to replace my alternator with an Internally Regulated Alternator for the harness setup here. https://www.summitracing.com/parts/aww-500560 I would like to keep with the v style pulley and reuse components from my 350. Anyone ever dealt with this an know what alternator I should buy? __________________ Progress thread for my 66 http://67-72chevytrucks.com/vboard/s...d.php?t=623848

12-20-2019, 08:01 AM	#2
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: Internally Regulated Alternator for a 66 with a L31 Swap options? I have an L31 in my 66 and have done the one wire setup. I'll see if I have it written down what one I used. It may have the part number tag on it, I'll look. You can change the pulley also on these. I used a long water pump, the factory left hand side alternator mounts and power steering setup all from a 1975 small block. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

12-20-2019, 08:26 AM	#3
rpmerf Registered User Join Date: Feb 2011 Location: Parkville, MD Posts: 1,024	Re: Internally Regulated Alternator for a 66 with a L31 Swap options? All kinds of info here on swapping to a 12SI (3 wire): http://www.madelectrical.com/electri...elcoremy.shtml There is a list of part numbers for different amperages and clocks. I converted my 70. Sill uses the V belt setup. __________________ 1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z

12-20-2019, 11:05 AM	#4
msg Registered User Join Date: Feb 2013 Location: GA Posts: 1,315	Re: Internally Regulated Alternator for a 66 with a L31 Swap options? thanks guys, I also called American Autowire and asked for a model year type that would work and since I have the L31 and will add AC he said that a 1980 Camaro would be fine for the v style pulleys with a long water pump. I went to Rockauto and saw a few new AC Delcos and there were 2 listed This one had a caution listed that I might need to change out the pulley...didnt understand why. Maybe it doesnt come with a pulley since I didnt see any pulley specs? Its $38 plus shipping. https://www.rockauto.com/en/moreinfo...035289&jsn=545 Then there was this one that didnt have the caution and did have pulley specs for $80 plus shipping. https://www.rockauto.com/en/moreinfo...sn=549&jsn=549 __________________ Progress thread for my 66 http://67-72chevytrucks.com/vboard/s...d.php?t=623848

12-20-2019, 01:13 PM	#5
vince1 Registered User Join Date: Jan 2013 Location: Calgary Alberta Posts: 1,170	Re: Internally Regulated Alternator for a 66 with a L31 Swap options? I'd get a cs130 from an 89 Pontiac safari and get an adapter plug to hook the alternator up to the new harness. https://www.rockauto.com/en/catalog/...generator,2412 https://www.hemmings.com/blog/articl...0-alternators/



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