Alternator ID and connections needed

[1 Old Man]

This is on a complete rewire job for a 91 5.0HO into a 57 Ranchero. I need help identifying this alternator and wiring connections. I've searched the internet for pics of it with the wiring connected to it without any luck. Other than the plug there is only one threaded point that's not insulated from the body so I assume that goes to ground but can't figure out the connection for battery charging or the 3 pins in the plug. Thanks in advance.

 

[89ripper]

Looks like someone upgraded their alternator, I can only guess from your pics. I believe that accepts a voltage regulator plug when people upgrade to a 3G alternator. Can you take more pics of the front and that threaded connector you are talking about?

 

[1 Old Man]

Here are a few more. I misspoke earlier, there are 3 more pins recessed in the outer casing 90degrees from the 3 pin plug. I put a bolt in the threaded connection to locate it. Sorry that's the best pick I can get without removing other items but if it helps, I will remove them.

 

[General karthief]

Pic of the wires?
Is the alt off the 91?

 

[85GTStangGuy]

With an external fan, wouldn't that make it a 1G alternator? But 1G's didn't have that type of electrical connection.... they had the stud and eyelet connections, didn't they?

 

[89ripper]

With an external fan, wouldn't that make it a 1G alternator? But 1G's didn't have that type of electrical connection.... they had the stud and eyelet connections, didn't they?

Thats what confused me initially, with OPs first post didnt show other 3 pronged connection so I assumed 3g. I have to go check my old alternator that I swapped to know for sure

 

[1 Old Man]

Pic of the wires?
Is the alt off the 91?

There are no wires to this. I need to build all of it other than the engine harness itself. I don't know where the Alt came from its a project car I got 12 years ago then had a few surgeries and now retired I am beginning work on it.

 

[85GTStangGuy]

Can you find a Ford part number anywhere on it?

 

[1 Old Man]

There is motorcraft on it and the plug says CR784 A71746 but I can't see a PT # on the Alt itself. I will remove it tomorrow and get better pics.

 

[1 Old Man]

Can you find a Ford part number anywhere on it?

1st pic is the only numbers on it. The 2nd pic showing BAT STA is above the lower side connection on the left in the 3rd pic. The 4th pic has A S I on the plug but also F and A in the recessed area by 2 screws, do F and A require wiring also?

 

[89ripper]

Who knows what brand of alternator that is? I had to go out in my garage to look but from what I can tell

Its some kind of 2g alternator. I had upgraded to a 3g awhile ago. Those embedded pics are of a 65amp jegs alternator. There are 2 harnesses used, ignore the threaded connection, that isnt used. So what is it you need to know? You are going to need the wiring off the mustang, correct?

 

[1 Old Man]

Knowing the Alt. I have id a huge help. I need to purchase the plugs so yes; I will look into getting mustang wiring if I can't locate the plug connector themselves. Maybe upgrading will be easier. thanks for the help much appreciated.

 

[89ripper]

No problem. 3g might be the way to go since the harnesses are known to get burnt up. 3g has a better design. Good luck to you.

 

[Mcmahst]

I wired the stock 2g alt from an 87 TBird into my 73 Mustang. It was quite easy. Just get the wiring harness for both vehicles. Good luck.