69 GTX Alternator

[Quintin]

The alternator began squealing the other day. I have no idea if it is stock or correct. Is there numbers somewhere to determine what it is. I don't want to change anything. Just out and in with the same thing.

 

[pnora]

Sounds like a loose belt. There should be a round tag on the field housing bolt. Posting a picture could help.

 

[dadsbee]

Belt or bearing... easy to determine which. Picture is worth a thousand words and if you want correct, if the alternator bearing is on it's way out, take the existing to a rebuilder and have him rebuild what you have. I assume this isn't your daily driver that needs to be ready to go tomorrow...

 

[Bird 426]

'69 should have what we call a round backside. Verses a flat back or square back. The round has 2 wires and the square has 3 wires.

 

[Jerry Hall]

There are dual field and single field round back alternators.

 

[Quintin]

It's definitely the rear bearing. Easy to tell with the stethoscope. Probably have it rebuilt. Looks like it was rebuilt before by Don Duff. I've had it over 10 years so he must do decent work. Curious who or where he is.

 

[Mebsuta]

From Googly, Don Duff Rebuilding in Livionia MI, est 1961. I don't think they are in business any more, and are probably playing golf in Florida now.

 

[Quintin]

So I would guess sometime in the last 55 years my car was in Michigan. Interesting. Hate to say it but that is the most history I have on this car. Sure like to know where it was all it's life.

 

[Nacho-RT74]

'69 should have what we call a round backside. Verses a flat back or square back. The round has 2 wires and the square has 3 wires.

As mentioned on next reply after your one, there are dual field alts for 70 and 71. Then 72 began with squareback design, being all dual field.

 

[Nacho-RT74]

It's definitely the rear bearing. Easy to tell with the stethoscope. Probably have it rebuilt. Looks like it was rebuilt before by Don Duff. I've had it over 10 years so he must do decent work. Curious who or where he is.

View attachment 1771099

View attachment 1771100

Rear bearing is easy to be replaced at home. No need for any special tool like front bearing could need.

 

[Quintin]

I just wanted it gone thru by somebody who knew what they were doing and more important what to look for. It's already done and ready to be picked up.