C2 Alternators, broad cast code, letter & color ?

[Alan D.]

[Wayne M.]

Re: C2 Alternators, broad cast code, letter & color ?

Looks like letter "H" (red) on this '65 1100696 42 amp 5G7. Not aware of a list.



x

[Alan D.]

Re: C2 Alternators, broad cast code, letter & color ?

Thank Wayne,
Do you know what it was used on, for example I'm making a list like the following;

64 42A 1100669 red Y 365/375 w TI


Now if my pn is correct (from JG) why did GM make another 42A unit?

[Wayne M.]

Re: C2 Alternators, broad cast code, letter & color ?

Alan -- I have absolutely no idea whey Delco made so many distibutors in that timeframe with the same amperage rating. I too have a 1100669, 42 amp, 3M17, and another 1100691 42 amp with a 9G11 assembly, the only difference being the rear case of the latter has a threaded boss by the bearing, for mounting flexibility, I suppose.

I don't think the pulley affected the part #, as that alternator I show in the pic above would have been installed on late '65 K66 H/Per. cars; a L76/L84, or maybe a L79 w/o P.S. Same alternator on a 396, except pulley would be different.

[Alan D.]

Re: C2 Alternators, broad cast code, letter & color ?

Attempted to edit my post however things were very slow and it never made it.
Did find from Nolands Book that the 42Amp for 64 pn 1100669 did change for 65 to a 42Amp pn 1100696 which continued through 67 apparently on K66 cars. The information came from his survey results and for some reason his form for my car did not ask about alternators lots of other stuff.

[Alan D.]

Re: C2 Alternators, broad cast code, letter & color ?

Well did a lot of searching however unable to find all the answers on those ink stamps. Saw a lot of original alternators pictured and noticed another thing; (These computers can lead one astray real fast)
The stators are always black! I have two original 1100693 & both are black.

[Terry M.]

Re: C2 Alternators, broad cast code, letter & color ?

I know your primary interest is not C3s, but you did mention them in the first post.

All C3 alternator broadcast codes are black, and a complete list is in the respective TIM&JG for 1968-1972. I am not familiar enough with the newer C3s to tell you much except all the broadcast codes I have seen are black also.

Also the location of the C3 ink stamp is less certain than you have indicated for C2s.I have seen C3 broadcast codes all over the place. I also sometimes see another single letter stamped in black ont he alternator. The significance of this has eluded us thus far.

[Michael H.]

Re: C2 Alternators, broad cast code, letter & color ?

C2 (and C3's) had an ink stamp on the housing usually above the electrical wiring connector.
From past posts it appears that the stamp, (broad cast code, think its called?) were different letters and colors used to identify what the alternator was.


For example a 63, 1100628, was a green stamp - letter ???
A 64, 1100669, red stamp – letter Y
So I have seen from original alternators colors of green, black, & red


Is there a list of these anywhere, color and letter?

Alan,

You are correct. While some assumed the ink stamp color was random, it actually was used to identify the amp rating of the alternator, at least for 63-65.

For a 37 amp unit, the color is green. (used for all base engines without A/C or T/I)

For a 42 amp unit, the color is red. (used for all engines with T/I)

For a 63 (?) amp unit, the color is black. (used with air conditioning)

Several different letters have been seen and my guess is that it identified the worker at Delco that assembled the unit?

[Michael H.]

Re: C2 Alternators, broad cast code, letter & color ?

For the 1963 model year, the 42 amp alternator was a 1100629. (37 amp was 1100628) Below is an NOS 1100629 dated Sept 1962. The ink stamp is red, just like other later various part numbered 42 amp units. The 629 would have been used on passenger cars.
I think we have to agree that the red code is used for all 42 amp units for at least 63-65.

[Alan D.]

Re: C2 Alternators, broad cast code, letter & color ?

Nice pictures, thanks. So what was the 42 Amp used on in 63 (TI not born yet?)

And yet another black stator! So it seems a lot of these were black not camel.

[Michael H.]

Re: C2 Alternators, broad cast code, letter & color ?

Nice pictures, thanks. So what was the 42 Amp used on in 63 (TI not born yet?)

And yet another black stator! So it seems a lot of these were black not camel.

The 1963 printing of the parts book states that the 42 amp 1100629 was used to service the 37 amp 1100628. (the 628 was not available in service) The 629 was probably used on a passenger car with some option that required a bit higher amperage.

Yes, black stator center plates. I don't think ANY 63-67 alternator stator plates were ever originally caramel color. They were all black.

[Doug L.]

Re: C2 Alternators, broad cast code, letter & color ?

Hi Guys,
I'm following this thread because it pertains to my '64 which has the 37 A alternator. I was not aware of the broadcast code which surprises me. I'm traveling overseas so don't have access to the Judging Guide but I don't recall seeing anything about this stamp in that book or in the Adams book. I recall reading about the stamps on the diodes and have had stamps made to apply that data to the 2 different sets of diodes, but I remember nothing about the broadcast code. Is it mentioned in the JG?

If I am following correctly, there is no list of correct letter codes, only the knowledge of the color used on each different alternator output.

I think the JG may indicate caramel colored stator plates but I was informed by several members that they should be black. Mine came back from the re-builder with caramel color but I painted them flat black.
Doug

[Michael H.]

Re: C2 Alternators, broad cast code, letter & color ?

I wonder if anyone noticed that the 63 AIM calls out a "color code" for ID for both alternators that were used that year. Look at the base engine section and read the list of items attached to the engine. The alternator part number in the list also includes the color code. (green for 37 amp)
The A/C section shows the black code for the higher amp alternator.

I don't know if the 64 AIM has such a code (red) for the 42 amp unit.

[Alan D.]

Re: C2 Alternators, broad cast code, letter & color ?

The 64AIM for base engine, Sec6 sheet A2.00, no longer shows a color, now the AC, Sec C60 sheetC2.00, calls for black.
Don't see any information for the K66 TI alternator upgrade to the 42 Amp unit wonder how they knew on the line?