carrino

can someone tell me if i have a internal or external regulated alternator on a 70 bbc
i think that it is external but i just am not sure.
is the voltage regulator located on the drivers side inner fender?

also what would happen if i install a internal regulated alt on.
and vise versa. :crazy:

lbell101

I'm pretty sure they went to internal in mid 1969. I'm sure they are internal in 1971. Just look at one of the vette vendors website and see what they are selling for your application.
I'm not sure what happens if you put in the wrong alt. Without any reg, I'd think you would put out way too much voltage.

377vette

Hey dude you have an external Alt. if knoew has changed it already. The way to tell is the connector with the small wires if it is allmost square it is external if it is allomst flat it is internal. As for the regulator not sure were it is i have an 81 wich is internal. But as far as that car goes they didn't start internal regulators till 75 or 76. Hope this was helpful good luck.

carrino

thanks for your replys
i called a couple of parts stores and they both asked if it was internal or external.
they list 2 part numbers for a 70 internal and external.??????????
can you see why im confused :lol:

lbell101

You are not correct. The 71 Vette was internally regulated as it used a 10-SI alternator. I can't be sure of 1970 but they were certainly internally regulated before the dates you posted.
Here's the Sun Service info for 1971: http://www.71corvette.com/sun2.jpg

377vette

I'm sorry i stand corrected! But i will tell you in the 19+ years i have been an auto tech i have never seen a decotron earlier then 75 or 76 sorry for the bad info. again good luck with your delima as per manual pic. you can see the flat plug as i desrcibed.

carrino

thanks again.
well we at least got it with in a one year discrepency
but 1 year could mean a lot



[Modified by carrino, 10:05 PM 5/21/2004]

Larry B.

Actually ALL 69's and up used internal regulators. In 69, Corvette's were the ONLY GM cars to use the internal regulator. GM made their total line internal by 71. This always confuses the Auto part counter guys. Also interesting is the fact that Corvettes have smaller crank pulleys than other GM counterparts so if you don't get a corvette specific alternator you will have no amperage output al low speed.. Most if not all rebuilders group them all together with Chevy so...The rebuilders don't care.. One size fits all. RIGHT! !! :cuss

69er

I believe if your alternator's plug prongs are like this I I (up and down) it's external.
If _ _ (horizontal) its internal.


[Modified by 69er, 5:49 AM 5/22/2004]

ettev

1970 was the first year that the vette went to internal regulators. I'm pretty sure they were internal for ALL engine options of that model year.

Larry B.

1969 Corvette only..1970 corvette plus a few other GM model
1971 all gm went to internal regs.

Z QQH 6

:iagree: