Identify this alternator

Rat Rods Rule

Help Support Rat Rods Rule:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
jmlcolorado

jmlcolorado

Well-known member
Joined
Jul 23, 2010
Messages
1,839
Location
The flat plains of Elbert County, CO
Probably a silly question to most.
This came on my cummins 4bt. I assume it's a GM alternator.

It has 2 posts
1 large post marked BAT
1 smaller post marked R.
And a ground bolt.

Looking to figure out the proper way to wire it. It does not have any spade connectors on it.
I assume I need to get an external regulator/rectifier for it?
Let me know your thoughts.



 
The case looks like GM, but I can't identify what it is with the connection configuration. Hopefully someone else knows.

EDIT: Any chance there's another post on the other side of the BAT post, like this one?

DRA19020310(2).jpg


If so, it's a 22SI GM alternator. Unfortunately I can't find a good diagram, but maybe this will help 22SI Wiring Diagram Search

Also, do you know what voltage it would be based on what it was out of? Some were 24V, I believe.
 
Last edited:
05snopro440 said:
The case looks like GM, but I can't identify what it is with the connection configuration. Hopefully someone else knows.

EDIT: Any chance there's another post on the other side of the BAT post, like this one?

DRA19020310(2).jpg


If so, it's a 22SI GM alternator. Unfortunately I can't find a good diagram, but maybe this will help 22SI Wiring Diagram Search

Also, do you know what voltage it would be based on what it was out of? Some were 24V, I believe.
Click to expand...

There were no other obvious posts other then the 2. I'll take a closer lol tonight though.
Good call on the voltage!!
This very well could be 24 volts.
If I start the engine, can I put a multi meter on the ground and BAT post on the alternator to check? Or does power need to go through a regulator first to measure clean power?
 
Delco. All you have to have is the POS battery big lug and a ground. R post is for remote sensing, not required to make it work most of the time. If it doesn't charge, connect the R terminal to a 12vollt source switched by the ignition. They are internally regulated.
I just bought one yesterday for my semi, $200 bucks. Delco 24SI.
 
05snopro440 said:
The case looks like GM, but I can't identify what it is with the connection configuration. Hopefully someone else knows.

EDIT: Any chance there's another post on the other side of the BAT post, like this one?

DRA19020310(2).jpg


If so, it's a 22SI GM alternator. Unfortunately I can't find a good diagram, but maybe this will help 22SI Wiring Diagram Search

Also, do you know what voltage it would be based on what it was out of? Some were 24V, I believe.
Click to expand...

Bamamav said:
Delco. All you have to have is the POS battery big lug and a ground. R post is for remote sensing, not required to make it work most of the time. If it doesn't charge, connect the R terminal to a 12vollt source switched by the ignition. They are internally regulated.
I just bought one yesterday for my semi, $200 bucks. Delco 24SI.
Click to expand...




Winner winner!
There is/was a 3rd post marked I.
Appears it was unceremoniously removed for clearance on the oil filter.
Thanks for your help guys!

 

Similar threads

B
cummins 6BT swap - alternator
Replies
1
Views
3K
Willowbilly3
W
Oldphart
Help with setting up a four link rear suspension
Replies
5
Views
3K
Old Iron
Old Iron
O
rat rod race car
2
Replies
29
Views
5K
skull
skull
jfg455
LSX based motors
Replies
11
Views
14K
jfg455
jfg455
A
pull the battery?
Replies
8
Views
3K
andreasklapp
A

Latest posts

Back
Top