Early '69 Alternator Clarification

[Kevin S.]

I have an early 1969 Coupe L-46 350/350 with PS, PB, and AC. Build date is October 31, 1968.

I believe that I should be looking for a 1968 alternator 1100750 61 Amp with CD broadcast code and something in the range of 8H (August 1968) or 8J (September 1968) with any two digit day of the month. 1st choice would be 8J (Sept.) and 2nd choice would be 8H (August). Guess I could even go with 8K (October 1968) as long as the day of the month was prior to October 31, 1968.

More I look at my 5th edition tech information and judging guide the more I confuse myself and start thinking that I should be looking for 1969 alternator 1100825 61 Amp with broadcast code CT and the same date stamps 8H or 8J and day of the month since I have a 1969 model year car? I'm confused.

I realize that finding either one of these alternators will be difficult. Would be a very bad day to spend the money only to find out that I got the wrong alternator if one ever comes up. Any clarification you can help me with is greatly appreciated.

Kevin

[Jeffrey S.]

Re: Early '69 Alternator Clarification

A '68 alternator will not have an internal voltage regulator as does the '69. The 825 you suggest would be good as would a 1100882 or 884. The AIM indicates 1100825. All are 61 amp and have the first year internal VR. They are very unique both front and back to '69 model year.
Jeff

[Kevin S.]

Re: Early '69 Alternator Clarification

Hi Jeff,
Thanks for the clarification regarding no internal voltage regulator on the 1968 alternators. That helps narrow my search to 1969 only.


If I have this right, I could try to source any of the following 1969 alternators: 1100825, 1100884, or 1100882 based on the single asterisk note listed with all three of these alternators stating, "these may have been used on any car requiring a 61-amp alternator (with air conditioning or TI)". Since the AIM indicates 1100825, as you mentioned, I guess that would be my best case scenario if I can find one of those with the right date.

Not sure about the 1100884? My 5th edition book states the 1100884 would work in terms of the single asterisk and being a 61-amp alternator but there is also a triple asterisk connected to "w/o PS*** and my car has power steering so I'm not sure what to make of that info. The triple asterisk states, "we believe this is correct, but more research needs to be done on these alternators and pulleys." I have the 5th edition book so perhaps there is better information today indicating whether 884's are okay with PS or 884's are still associated w/o PS?

Jeff, thank you. Your input has helped.

Kevin

[Joseph W.]

[Joe L.]

Re: Early '69 Alternator Clarification

Hi Jeff,
Thanks for the clarification regarding no internal voltage regulator on the 1968 alternators. That helps narrow my search to 1969 only.


If I have this right, I could try to source any of the following 1969 alternators: 1100825, 1100884, or 1100882 based on the single asterisk note listed with all three of these alternators stating, "these may have been used on any car requiring a 61-amp alternator (with air conditioning or TI)". Since the AIM indicates 1100825, as you mentioned, I guess that would be my best case scenario if I can find one of those with the right date.

Not sure about the 1100884? My 5th edition book states the 1100884 would work in terms of the single asterisk and being a 61-amp alternator but there is also a triple asterisk connected to "w/o PS*** and my car has power steering so I'm not sure what to make of that info. The triple asterisk states, "we believe this is correct, but more research needs to be done on these alternators and pulleys." I have the 5th edition book so perhaps there is better information today indicating whether 884's are okay with PS or 884's are still associated w/o PS?

Jeff, thank you. Your input has helped.

Kevin

Kevin-------

The 1969 alternators are among the most difficult and expensive of ALL Corvette alternators. That's because 1969 Corvettes were among the very first GM vehicles to use the internal regulator type alternators (type SI). The alternator part numbers originally installed on 1969 Corvettes were unique to Corvettes and no other GM vehicles.

The alternator case configuration, both front and rear, was also unique to 1969 and, possibly, some very early 1970 Corvettes.

The only other non-Corvette that used an SI series alternator with the same case configuration as 1969 Corvette (but not the same part numbers) was some 1969 Pontiacs with heated rear windows.

[Steven B.]

Re: Early '69 Alternator Clarification

Hi Kevin, for what's it's worth, my '69 350/350 a/c, NO power brakes or steering, 4 spd convertible and a Dec. 4, 1968 build date has the
1100882 with a 11/13/68 date. It can be confusing! Good luck.

Steven Berson

[Kevin S.]

Re: Early '69 Alternator Clarification

Hi Steven,
Appreciate that information. As mentioned earlier, my 5th edition book has this listed for the 1100882 you mentioned, ... "435 HP, L88, L89 with TI, w/AC & PS***" but clearly you have the same L46 350/350 small block as I have so I now know the 882 was not exclusively for big block cars only. That helps. You have AC so that works for 882 but NO power steering? Wow, there's a twist since it shows "w/AC & PS" for the 882.

I would have thought you would have the 884....since that one says "w/AC & w/o PS" which is the combination you have. Oh well, back to being confused - still?

Not sure I will find 825, 884, or 882 but at least it would get me in the 1969 61-Amp alternators which I know that I need for AC & PS.

Thanks Steven

[Kevin S.]

Re: Early '69 Alternator Clarification

Thank you for the details, Joe. Very much apprecated.

[Terry M.]

Re: Early '69 Alternator Clarification

Thank you for the details, Joe. Very much apprecated.

I don't wish to muddy the waters in your quest to determine the appropriate alternator for your car, but just to provide a little additional information. In addition to the unique to 1969 rear case Joe L refers to the internals for early 884 alternators contained unique diode trios and regulators. The configurations of these early parts is radically different than the 1970 and newer parts. Some parts of the configurations are visible through the rear openings in the case. I doubt many judges are aware of this and we chose not to include it in the TIM&JG due to the lack of appropriate images. I have seen only one of these in my time of observing Corvettes and it was brought to my attention by the owner of that example. Since it applies to so few examples my opinion is it is over the top and not worthy of observing, but if you do find an appropriately dated 884 and the internals look strange -- or your rebuilder indicates something strange -- you may have the second example and I would appreciate some good quality photos. Please be in touch if this magic happens.
This is just one example of the joys of Corvette research.

[E S.]

Re: Early '69 Alternator Clarification

Terry-Little off subject, but I have a 69 alternator with the NT broadcast code, but the car came with TI and P/S.
(9J5) date- Maybe good for research data?
E.J.

[Terry M.]

Re: Early '69 Alternator Clarification

Terry-Little off subject, but I have a 69 alternator with the NT broadcast code, but the car came with TI and P/S.
(9J5) date- Maybe good for research data?
E.J.

E.J.
Might be. I didn't record, nor do I remember, the date of that alternator. I now wish I had photographed those pieces he held in his hand, but I think it was before the days of digital cameras.

Is the alternator on the car? Even if it is loose We would have to arrange a meeting .

[E S.]

Re: Early '69 Alternator Clarification

Terry- Alt. is on car- (It has never been removed)- I am just referring to the alternator broadcast code table on pg. 146 of the 68-69 TIMJG (6th ed.)
It seems to indicate that the NT broadcast code was for "all w/AC, TI, but without PS"- But then adding that more research is needed....
E.J.

[Gary B.]

Re: Early '69 Alternator Clarification

E.J.
Right now the 6th Edition reads: All with air conditioning or TI, w/AC & w/o PS
What do you think it should read?
I'll update it.
Gary Bosselman

[E S.]

Re: Early '69 Alternator Clarification

Gary-Sorry-I miss-read the "NT" Broadcast code-my car has TI and PS, which would be included in "All with air conditioning or TI".
I saw the w/o PS !!-My bad!
E.J.

[Gary B.]

Re: Early '69 Alternator Clarification

E.J.
No harm. If it's confusing to one person, it will be to others.
Reason asking was to clarify, make clearer.
Gb