C3 Correct 69 Alternator Pulley

[Michael B.]

After a short search and a few bucks I have acquired a correctly dated 1100825 alternator for my October 3 1968 build date 1969 L68 w/TI. Yahoo!

Now the alternator I am removing is a 1100928 55A 1C07 from a 71 Firebird or GTO. It also has a deep grove pulley that I thought was correct for my 69, but is different. Which of these two is a correct 1969 pulley?

[Joe L.]

Re: C3 Correct 69 Alternator Pulley

Mike-----

If the car has power steering, the pulley on the left is the correct one. If the car has no power steering and no A/C, then the pulley on the right is likely the correct one IF it's 3-5/8" OD. If the car has A/C but no p/s, then likely neither pulley is correct. It's hard to be sure just by looking at the photos.

Also, please post a photo of the REAR of both alternators.

[Michael B.]

Re: C3 Correct 69 Alternator Pulley

Joe,

This is the alternator discussed in late November, early December. I was able to work out a deal with Leslie. I got her 825 and she got a fresh 884, both with appropriate date codes. The rear case is correct including the Delco logo, rectangular marking and flat screw hole. My car does have P/S and no A/C so it looks like I'll have to swap pulleys. The 825 is pictured on the right. I'll post additional pictures tonight.

Mike

[Michael B.]

Re: C3 Correct 69 Alternator Pulley

Both pulleys are 3-5/8 diameter. The one on the right (bottom) has a part # 3829387-AI faintly stamped on the front. I can see the need for the groove to be farther forward on the P/S model.

Should the fan be black, silver, or zinc dichromate plated?

[Michael B.]

Re: C3 Correct 69 Alternator Pulley (Backs)

Photo of the backs.

[Joe L.]

Re: C3 Correct 69 Alternator Pulley

Mike-----

The fan should be galvanized steel (i.e. "silver"). Some may have been zinc plated and would, thus, still be "silver".

[Joe L.]

Re: C3 Correct 69 Alternator Pulley (Backs)

Mike-----

Rear case half on the right is the correct 1969 configuration. The one on the left is a much later unit.