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AD244 Alternator Cross-Reference

  #1  
Old 02-02-2019, 02:55 AM
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Default AD244 Alternator Cross-Reference

So I've been looking for a way to identify AD244 145A alternators to which I could upgrade. Please comment on what you think of my results.

I learned that there are similar alternators rated at 130A for which the RPO code is KG8. Also, there are some of the KG3 RPO vehicles that had the 2-wire plug instead of the required 4-wire plug.

A summary of the information I found is below.

Current part numbers: 19151921, 19244751, 20989650, 22781130, 3211845, 3212128
plug configuration: 4-wire
RPO code for 145 A: KG3

Web pages with cross-reference information:
https://www.rockauto.com/en/moreinfo...&jsn=27&jsn=27
https://www.gmpartsxperts.com/oem-pa...zIFBh%E2%80%A6
https://www.rockauto.com/en/catalog/...generator,2412

Vehicles with the desired alternators:

Summary Application chart (see the attached list for the detailed applications with trim and engine size: "AD244 alternator cross reference.pdf" )
Year(s) Make Model
2004-2005 BUICK RAINIER
2003-2004 CADILLAC ESCALADE
2003-2004 CHEVROLET AVALANCHE 1500
2003-2006 CHEVROLET AVALANCHE 2500
2003-2007 CHEVROLET EXPRESS 1500
2003-2016 CHEVROLET EXPRESS 2500
2003-2016 CHEVROLET EXPRESS 3500
2009-2016 CHEVROLET EXPRESS 4500
2003-2006 CHEVROLET SILVERADO 1500
2007 CHEVROLET SILVERADO 1500 CLASSIC
2003-2006 CHEVROLET SILVERADO 2500
2007 CHEVROLET SILVERADO 2500 CLASSIC
2003-2006 CHEVROLET SILVERADO 3500
2007 CHEVROLET SILVERADO 3500 CLASSIC
2003-2004 CHEVROLET SSR
2003-2004 CHEVROLET SUBURBAN 1500
2003-2006 CHEVROLET SUBURBAN 2500
2003-2004 CHEVROLET TAHOE
2003-2005 CHEVROLET TRAILBLAZER
2003-2005 GMC ENVOY 5.3L
2003-2007 GMC SAVANA 1500
2003-2016 GMC SAVANA 2500
2003-2016 GMC SAVANA 3500
2009-2016 GMC SAVANA 4500
2003-2006 GMC SIERRA 1500
2007 GMC SIERRA 1500 CLASSIC
2003-2006 GMC SIERRA 2500
2007 GMC SIERRA 2500 CLASSIC
2003-2006 GMC SIERRA 3500
2007 GMC SIERRA 3500 CLASSIC
2003-2004 GMC YUKON
2003-2004 GMC YUKON XL 1500
2003-2006 GMC YUKON XL 2500
2003-2007 HUMMER H2
2003-2005 ISUZU ASCENDER
2005 SAAB 9-7X

Edit: For the Envoys, the right alternator came with the ones with the 5.3L.
 

Last edited by christine_208; 02-12-2019 at 10:52 AM. Reason: Added info
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Old 02-02-2019, 07:25 AM
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You have certainly put A LOT of time into researching alternator applications! I cannot comment on 99% of the data, but I can tell you that that 2003 to 2005 Envoys have the 4.2 inline 6. The alternator case has a different mounting design and will not bolt right up to a 4.3.

i have plenty of pet projects myself, but when I upgraded my two alternators I figured time was money and just bought new ones. One is an AC Delco and the other is from NAPA. One has slighter higher amp output, but I can’t remember which off the top of my head.

Just my 2 cents...

Keep up up the good work!
Chris
 
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Old 02-02-2019, 11:09 AM
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Originally Posted by CWBDDSPC View Post
You have certainly put A LOT of time into researching alternator applications! I cannot comment on 99% of the data, but I can tell you that that 2003 to 2005 Envoys have the 4.2 inline 6. The alternator case has a different mounting design and will not bolt right up to a 4.3.

i have plenty of pet projects myself, but when I upgraded my two alternators I figured time was money and just bought new ones. One is an AC Delco and the other is from NAPA. One has slighter higher amp output, but I canít remember which off the top of my head.

Just my 2 cents...

Keep up up the good work!
Chris
That is a good head's up.

So I looked at my detailed list that was attached as a pdf and what I learned is that some of the them came with 5.3L engines! It is those that the the right alternator. I'll be updating the information above accordingly.

Thanks for the feed back.

P.S. It wasn't too hard to track down this information. I'd spend a little time each night over a few nights. It was a fun puzzle to solve.
 
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Old 02-03-2019, 08:20 AM
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Ah yes, the 5.3... Forgot about that one. The 05 that I junked had the 4.2 with the bigger alternator. I was excited to find it, until I saw it wouldnít fit .

Side note, one of my patients has a Trailerblazer SS with the 6.0...... that would be a fun ride!
 
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Old 02-11-2019, 09:38 PM
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Great info! This is one of many projects I'm planning for this spring/summer.

Btw, I've been looking into buying one of those Trailblazer SS's. Such a sweet ride, but cannot find one with lower mileage at a decent price. I'll keep looking.
 
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Old 02-12-2019, 11:33 PM
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...so I'm having trouble deciphering all this, and my apologies for being so dense but: if I'm understanding correctly, the major takeaway from all this should be that if you go to a junk yard and look for a late-ish model GMC Savana or Chevy Express 3500+ van then you can get a stronger (145A vs 100A) alternator that will be a drop-in fit?
 
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Old 02-12-2019, 11:49 PM
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Originally Posted by Rock18 View Post
...so I'm having trouble deciphering all this, and my apologies for being so dense but: if I'm understanding correctly, the major takeaway from all this should be that if you go to a junk yard and look for a late-ish model GMC Savana or Chevy Express 3500+ van then you can get a stronger (145A vs 100A) alternator that will be a drop-in fit?
No worries. What you described is pretty much how I have interpreted what I learned with the added requirement that it have the right RPO code. This was put together from online documents but I have not tested these applications.

To borrow an expression from the mathematicians, finding a Chevy Express 3500 van or a GMC Savanna of the right years "is a necessary but not sufficient condition" to ensure you get a 145A drop-in alternator.

As best as I could figure, the 145A alternator was available as an option on all Chevy Express 3500 and GMC Savanna vans but they might not have all come with them.

For instance, off the top of my head, RPO KG8 was a 135A alternator that could also fit our Blazers. This is still an improvement but we might as well get the 145A one, right?

Does that help?

P.S. What I plan to do when it gets warmer is go to a u-pull yard with the spread-sheet file and cruise the GM/Chevy truck section looking for likely vehicles and then check them against the list and look for the right RPO code. What I do not know very well are the engines by sight which seems to be one of the determining factors if a vehicle had a KG3 code or not.
 

Last edited by christine_208; 02-12-2019 at 11:53 PM.
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Old 02-13-2019, 10:37 AM
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I've read that the two wire alternators can have the regulator switched out and replaced with the 4 wire setup. Supposedly this lets you plug in your connector to the alternator. The reason this is supposed to work is the newer alternators are computer controlled and they will resort to a limp mode and still put out about 14 volts without the computer. Don't know if it's gospel or not but I have one and one of these days I'll bolt it up and try it out.
 
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Old 02-13-2019, 10:46 AM
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I have read that yes it’s possible to change out the regulators. Didn’t know about the defaulting to limp mode though. Interesting stuff!

 
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Old 02-13-2019, 10:58 AM
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Originally Posted by eshaw View Post
I've read that the two wire alternators can have the regulator switched out and replaced with the 4 wire setup. Supposedly this lets you plug in your connector to the alternator. The reason this is supposed to work is the newer alternators are computer controlled and they will resort to a limp mode and still put out about 14 volts without the computer. Don't know if it's gospel or not but I have one and one of these days I'll bolt it up and try it out.
Originally Posted by CWBDDSPC View Post
I have read that yes itís possible to change out the regulators. Didnít know about the defaulting to limp mode though. Interesting stuff!
Yes I've heard the same about the 2-wire vs 4-wire. To the best of my ability, the alternator for the vehicles in the list I compiled are all 4-wire ones like in out Blazers. With so many available, I would not think it worth the effort to do a conversion unless you already had one of the 2-wire ones.
 

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