Alt question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mdazb · 01-24-2005, 01:05 AM

I got a used Alternator from a friend, It looks like the one that installed on my 350.( External reg.) All I know is that he got it off of a '75 chev. truck w/350. How can I tell if it has an internal reg? And when did they stop the extrenal reg on trucks?

Thanks in advance

3 on the tree · 01-24-2005, 01:11 AM

Internal regs have a thin two wire plug that goes in the side-look for a small slot with two blades visible.

Hooter · 01-24-2005, 01:14 AM

well it will definetly be an internally regulated alternator if it is on a 75 chev truck, they started putting internally regulated alts on chevys in late 72 and all chevys had that alt in 73. The way you can tell is, the internally regulated alts have a flat rectangular plug on the top and the externally regulated use a square plug

Brainchild · 01-24-2005, 03:05 AM

An internal regulated alt will look like this,external regulated ones plug into the back.

68w/sbc406 · 01-24-2005, 03:13 AM

internal one looks like the one posted above (even though it doesnt have the right plug) and a external is a square shaped plug with the conectors stacked instead of side by side

mdazb · 01-24-2005, 08:54 AM

Thanks guys, anyway to tell the amperage?

JimKshortstep4x4 · 01-24-2005, 09:55 AM

The case should be stamped, E.G. "63 A".

Jim

01-24-2005, 01:05 AM	#1
mdazb Registered User Join Date: Oct 2004 Location: Nor Cal Posts: 75	Alt question I got a used Alternator from a friend, It looks like the one that installed on my 350.( External reg.) All I know is that he got it off of a '75 chev. truck w/350. How can I tell if it has an internal reg? And when did they stop the extrenal reg on trucks? Thanks in advance __________________ --------------------------------- 72 C10 SWB 350 Work in progress 98 HD Fatboy 09 HD Heritage Softail 05 Honda Element

01-24-2005, 01:14 AM	#3
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	well it will definetly be an internally regulated alternator if it is on a 75 chev truck, they started putting internally regulated alts on chevys in late 72 and all chevys had that alt in 73. The way you can tell is, the internally regulated alts have a flat rectangular plug on the top and the externally regulated use a square plug __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

01-24-2005, 03:05 AM	#4
Brainchild Still drivin' a Rat Rod Join Date: Sep 2004 Location: Monett Missouri Posts: 4,925	An internal regulated alt will look like this,external regulated ones plug into the back. __________________ Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the a$# 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website

01-24-2005, 03:13 AM	#5
68w/sbc406 Got Light Emitting Diode? Join Date: Apr 2004 Location: Newberg, OR Posts: 2,485	internal one looks like the one posted above (even though it doesnt have the right plug) and a external is a square shaped plug with the conectors stacked instead of side by side __________________ 1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car) 1993 Cherokee work ride/weekend wheeler

01-24-2005, 08:54 AM	#6
mdazb Registered User Join Date: Oct 2004 Location: Nor Cal Posts: 75	Thanks guys, anyway to tell the amperage? __________________ --------------------------------- 72 C10 SWB 350 Work in progress 98 HD Fatboy 09 HD Heritage Softail 05 Honda Element

01-24-2005, 01:11 AM	#2
3 on the tree Registered User Join Date: Oct 2004 Posts: 392	Internal regs have a thin two wire plug that goes in the side-look for a small slot with two blades visible.

01-24-2005, 09:55 AM	#7
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	The case should be stamped, E.G. "63 A". Jim



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.