Alternator... internal or external reg? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hooker · 02-19-2007, 04:47 PM

I know this is a stupid ? but how can you tell the difference between an int and ext regulated alt?

cooters · 02-19-2007, 05:14 PM

internal regulator chev alternator has a 2 blade connector with the 2 blades in line with each other, the external alt has 2 blades parallel with each other. int plug is on outside edge of alt, ext reg plug is on the back

65-72 chevytoys · 02-19-2007, 05:43 PM

There are 4 GM alternators that are most common ones installed today: the externally regulated alternator used on most GM vehicles from 1963 to 1974; the "SI" series alternators with internal regulator used on almost all GM vehicles from 1969 to 1985; the "CS" series alternator with internal regulator used on GM vehicles from 1986 to 1999 and finally the CS 130/CS 144 (which has an internal cooling fan) from 1994. Check yours against these pictures so you can order the correct connectors.

With pictures here

02-19-2007, 04:47 PM	#1
Hooker aka TEX-TOY Join Date: Jan 2007 Location: Kentucky Posts: 127	Alternator... internal or external reg? I know this is a stupid ? but how can you tell the difference between an int and ext regulated alt? __________________ 1969 Chevy C10 SWB w/ disk brakes and soon to be lowered with spindles and springs!!!! Getting a paint job like a Army Chinook Helicopter!!!! HOOKERS RULE!! BRAND NEW WIFE BOUGHT IT FOR ME AS A WEDDING GIFT!!! SHE IS THE BOMB!!!!!!

02-19-2007, 05:14 PM	#2
cooters Senior Member Join Date: Oct 2006 Location: Edmonton Alberta Posts: 458	Re: Alternator... internal or external reg? internal regulator chev alternator has a 2 blade connector with the 2 blades in line with each other, the external alt has 2 blades parallel with each other. int plug is on outside edge of alt, ext reg plug is on the back Last edited by cooters; 02-19-2007 at 05:16 PM.

02-19-2007, 05:43 PM	#3
65-72 chevytoys Registered User Join Date: Dec 2006 Location: Wesley Chapel, Florida Posts: 1,113	Re: Alternator... internal or external reg? There are 4 GM alternators that are most common ones installed today: the externally regulated alternator used on most GM vehicles from 1963 to 1974; the "SI" series alternators with internal regulator used on almost all GM vehicles from 1969 to 1985; the "CS" series alternator with internal regulator used on GM vehicles from 1986 to 1999 and finally the CS 130/CS 144 (which has an internal cooling fan) from 1994. Check yours against these pictures so you can order the correct connectors. With pictures here __________________ 2004 Chevy Silverado 1500LS SWB 5.3L 2004 Corvette Z16 #770 Wish I had not sold 72 blazer

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