1966 Alternator Question

[Robert M.]

My 300hp non a/c car has a 55 amp alternator #1100692 with date code 6D28( April 28, 1966). I believe the alternator should be a 37 amp #1100693, so I am planning on replacing it. Is the ...693 the right alternator or could I use the 55 amp 1100694 and still be correct? Also does anyone have any ideas about the alternator (692) that is on there now, it is the correct date period but must be off another type of car. Thanks for any help. I will enclose a picture of the current alternator.

[Frank E.]

Re: 1966 Alternator Question

I believe the "694" is the correct number for a C60 rpo car. The "693" is for the non-ac application. I don't know what a "692" is for but I'm sure someone will chime in here that's certainly more knowledgeable than I....


Cheers...

Frank

[Wayne M.]

Re: 1966 Alternator Question

.....does anyone have any ideas about the alternator (692) that is on there now, it is the correct date period but must be off another type of car. ....

My Chevrolet P&A30 catalogs from the '65-7 time period don't show this unit, so it probably was off another GM product line, or even a non-GM usage.

The Delco spec books show it as 52 amp (not 55, as yours is), and it is designed for CW (I assume clockwise) rotation [don't know from what reference position]; whereas all other C2 alternator numbers that we are familiar with can function in EITHER direction (again, per Delco specs). So that rotation restriction is kinda weird, IMO.

[Joe L.]

Re: 1966 Alternator Question

My 300hp non a/c car has a 55 amp alternator #1100692 with date code 6D28( April 28, 1966). I believe the alternator should be a 37 amp #1100693, so I am planning on replacing it. Is the ...693 the right alternator or could I use the 55 amp 1100694 and still be correct? Also does anyone have any ideas about the alternator (692) that is on there now, it is the correct date period but must be off another type of car. Thanks for any help. I will enclose a picture of the current alternator.

Robert------



GM #1100692 was, indeed, a 55 amp alternator used for some 1966 Cadillacs. As far as I can tell, it was never a SERVICE-available alternator, so that means that all of them ever produced would have had 1965 or 1966 dates.

Is it possible that it was originally installed on your car? Yes, I'd say it's possible---not likely but possible. The 1100692 was clocked the same as the 1100694. So, from that element of configuration it should have worked and could have been used as an alternative to the 1100694. However, I don't know if the 694 was clocked the same as the 692. I strongly suspect it was not. If so, it's extremely doubtful that it would have been originally used for your application.

[Michael H.]

Re: 1966 Alternator Question

My Chevrolet P&A30 catalogs from the '65-7 time period don't show this unit, so it probably was off another GM product line, or even a non-GM usage

Wayne... could that be another one of those extremely rare black stators?

[Robert M.]

Re: 1966 Alternator Question

Thank you. Several of the bolt on parts are not correct(starter( build date 1969), fuel pump). This car has about 165,000 miles on it all put on before 1984(it sat from 1984 until 2007, the original owners death). I suspect the original owner put this alternator on the car but his step son can't recall any work being done to the car since before 1984(that's when he met his step dad and he said the car sat from at least that year and possibly earlier). He must had got the alternator some time in the 60's for it to be dated correctly. Build date on the car is May 31, 1966. I assumed it's not the original. Again thank you guys for all the help.

[John P.]

Re: 1966 Alternator Question

Rebuilders commonly mix and match cores.If you went to get a rebuild today you could very possibly get a 60s dated alternator. Red and black are very commonly used as insulating varnish at todays major rebuilders.

[Michael H.]

Re: 1966 Alternator Question

Rebuilders commonly mix and match cores.If you went to get a rebuild today you could very possibly get a 60s dated alternator. Red and black are very commonly used as insulating varnish at todays major rebuilders.

Or, it could be the original stator with it's original black ribs.

[Joe L.]

Re: 1966 Alternator Question

Or, it could be the original stator with it's original black ribs.

Michael------


I would say that the chances that this alternator has not been through a commercial rebuilding operation is zero. In fact, I believe I can see the rebuilder's "peeling off" label at the very top of the alternator but, whether or not that's the case, I'm virtually certain its origin is a commercial rebuilder. After a commercial rebulding operation, the only part of the alternator that's original to that alternator is the drive end case half.

[Michael H.]

Re: 1966 Alternator Question

Michael------


I would say that the chances that this alternator has not been through a commercial rebuilding operation is zero. .

I agree. THAT one is likely a rebuilt unit with non original paint on the stator ribs. However, it IS likely, or almost 99% certain, that alternators from the 60's had black stator ribs. I still haven't seen one that convinces me that caramel color was ever used in that time period. If it was, it definitely wasn't used on many.

[Wayne M.]

Re: 1966 Alternator Question

Wayne... could that be another one of those extremely rare black stators?

Michael -- at first I bit my tongue (ie. kept my fingers away from keyboard), but then I saw the rebuild stickers and the media-blasting surface texture that was done AFTER the code and date stamping (ie. no sharp clean imprint of the characters), so I wrote it off as a reconditioned unit that just "happened" to have black exposed stator laminations .

[Michael H.]

Re: 1966 Alternator Question

Michael -- at first I bit my tongue (ie. kept my fingers away from keyboard), but then I saw the rebuild stickers and the media-blasting surface texture that was done AFTER the code and date stamping (ie. no sharp clean imprint of the characters), so I wrote it off as a reconditioned unit that just "happened" to have black exposed stator laminations .

Yes, the case has obviously been blasted. The black paint on the stator looks old though. It's possible someone reused the original stator.

In either case, it wasn't a good example and I probably shouldn't have brought it up. We have a ton of other good pictures of NOS and originals that show the original black.