Alternator Castings for 1100825

[Royce S.]

Hi everyone,

I am trying to find the correct alternator for my '69 L-71 and received this from one of the parts guys out there and I'm not sure if it is correct or has the wrong stampings. From everything I have read in the TIM & JG and Alan Colvin's Corvette by the numbers, an 1100825 alternator should be 61 Amps not 42 A. Is this one not correct, or did they manufacture the 825 with two amp ratings? Any assistance or insight on this one would be greatly appreciated. I have attached a picture so you can see how it is stamped.

Thanks!

[Joe R.]

Re: Alternator Castings for 1100825

Hi everyone,

I am trying to find the correct alternator for my '69 L-71 and received this from one of the parts guys out there and I'm not sure if it is correct or has the wrong stampings. From everything I have read in the TIM & JG and Alan Colvin's Corvette by the numbers, an 1100825 alternator should be 61 Amps not 42 A. Is this one not correct, or did they manufacture the 825 with two amp ratings? Any assistance or insight on this one would be greatly appreciated. I have attached a picture so you can see how it is stamped.

Thanks!

Royce,

I am no expert on 69's for sure, but everything I saw online showed that it should be 61 A. The following web site shows it's for cars with A/C and TI, which would fit with the 61 A rating:

http://www.corvetteactioncenter.com/specs/c3/1969/69id.html

Hopefully more knowledgeable members will chime in soon. By the way, I hear there is at least one company that routinely restamps alternators.

Joe

[Jeffrey S.]

Re: Alternator Castings for 1100825

The 825 alternator as well as the 882 and 884 were all 61 amp and used on '69 A/C or transistor ignition cars. My guess would be that this one was a blank piece stamped incorrectly.
Jeff

[Joe R.]

Re: Alternator Castings for 1100825

The 825 alternator as well as the 882 and 884 were all 61 amp and used on '69 A/C or transistor ignition cars. My guess would be that this one was a blank piece stamped incorrectly.
Jeff

Jeff,

Are you implying that the piece Royce has could very well be a correct original part? Or that the restampers screwed up?

Joe

[Royce S.]

Re: Alternator Castings for 1100825

I think he is saying that it is NOT an original part, but a blank plate that was stamped and stamped incorrectly ... so a double no-no.

[Dick W.]

Re: Alternator Castings for 1100825

And it not too hard to figure out who stamped it.

[Joe R.]

Re: Alternator Castings for 1100825

Royce,

As you may know, a good way to get info here is to search the archives. The best way I've found is to search by part number. Here's what 1100825 brought up:

https://www.forums.ncrs.org/search.p...47831&uid=3308

Joe

[Wayne M.]

Re: Alternator Castings for 1100825

Delco-Remy test specs book DR-324S-2 shows 1100825 as a series 10SI, 61 amp @ 5000 RPM (alternator speed, I presume).

Do you know if the front face has 3 or 6 spokes ?

[Royce S.]

Re: Alternator Castings for 1100825

The face has six spokes.

[Jeffrey S.]

Re: Alternator Castings for 1100825

The face should also be the wide open type. There is much in he archives about '69 alternators with pictures of the castings. Royce is correct that I am of the opinion that the restamper made a mistake and that this is not an original stamping. The parts may very well be original Delco castings that were available from service with no stampings and then stamped to order.
Jeff

[Joe L.]

Re: Alternator Castings for 1100825

The face has six spokes.

Royce-----

The "6 spoke" drive end case configuration with spokes extending all the way to the very outer perimeter of the case is unique to 1969 and early 1970 alternators. However, I don't think that any 1100825 would have been originally stamped 42A. It is possible that some were stamped 55A, but I don't think that a single one was originally stamped 42A. If it happened, at all, it would be a factory mistake.

If you could post photos of the face of the drive end case and the face of the split ring end (rear) case, we might be able to tell you more about it.

[Royce S.]

Re: Alternator Castings for 1100825

Here are some additional pictures so that you can see everything about the alternator.

[Joe L.]

Re: Alternator Castings for 1100825

Here are some additional pictures so that you can see everything about the alternator.

Royce------



The GENERAL configuration of the drive end case half is correct. However, the center hub section does not look right to me. This may be some sort of a reproduction piece.

The split ring end (rear) case half is the 1970 style, not 1969. Note the raised rectangle below the Delco-Remy script and, especially, the raised grounding lug boss. While it's POSSIBLE that this case half might have been used for very late 1969's, I am virtually certain it was not used for a 1969 alternator built as early as late 1968. Although not correct for your alternator, this case half is a rare and difficult-to-find piece.

The photo below shows a known original 1969 drive end case half.

[Graeme B.]

Re: Alternator Castings for 1100825

The castings look correct.

[Dick W.]

Re: Alternator Castings for 1100825

Royce------



The GENERAL configuration of the drive end case half is correct. However, the center hub section does not look right to me. This may be some sort of a reproduction piece.

The split ring end (rear) case half is the 1970 style, not 1969. Note the raised rectangle below the Delco-Remy script and, especially, the raised grounding lug boss. While it's POSSIBLE that this case half might have been used for very late 1969's, I am virtually certain it was not used for a 1969 alternator built as early as late 1968. Although not correct for your alternator, this case half is a rare and difficult-to-find piece.

The photo below shows a known original 1969 drive end case half.

Joe, I believe that the subject case spent a little too much time in a Wheelabrator taking all the crispness off the features