Alternator Compatability

[OKLAGMCRUISER]

I kept my high output alternator that was a direct replacement for the stocker in my 99 Sierra 5.3L. Anyone know if it will be a direct replacement in my 05 YD? Reason I ask...I thought in 03 or 04 there was an alt change or voltage regulator change that might affect this what seems to be a simple swap. Now I have been lazy....so I haven't physically pulled the alt out of the attic and tried to swap them YET, but plan to try it sometime soon. I just don't want to waste my time going thru all of it if someone has already figured out it won't work. My additional concern is that the plug might not be the same. My hunch is all will work and I'm just worrying about nothing.

Pat

 

[blueflamed03]

Pat, me thinks they are the same, just some had higher voltage output.

 

[OKLAGMCRUISER]

Pat, me thinks they are the same, just some had higher voltage output.

i do now remember that there is a small and a large case...larger case had bit more output for 99-02, but now my yd has some strange bundle of wiring stuff going to the neg terminal of the battery...i think...that has to do with the voltage regulator and the battery saver crap GM invented. I just don't want to install this bad boy and it get fried for some reason and not even have an opportunity to sell it if i find it won't work. I guess i should just install it and see! LOL...Crap...it just hit me that this sucker needed a slightly higher idle to charge! Might have to wait to install it til AFTER i get a BB tune and have Justin modify my idle speed within the tune!

 

[blueflamed03]

yep, have him raise to like 650rpm at idle.

 

[OKLAGMCRUISER]

yep, have him raise to like 650rpm at idle.

i think it's 750 for mine... www.excessiveamperage.com

I honestly think this was the best mod i ever did to my sierra. i NEVER had an issue ever again with dimming, but i did have the big 3 mod and a red top to help it!

 

[blueflamed03]

Kinetik
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[OmarR]

Just get a smaller pulley for it.

 

[OKLAGMCRUISER]

Just get a smaller pulley for it.

it already has one on it, but thank you!

 

[05Yukon]

It wont work on an 05 I dont think. 05 Gm add a module to the alternator to get it to adjust the output.

 

[OKLAGMCRUISER]

It wont work on an 05 I dont think. 05 Gm add a module to the alternator to get it to adjust the output.

IGHT....That's what i was afraid of. I see during the day my gauge doesn't show anymore than a little over 12 v charging, but at night with lights on it's at 14v and i thought that had to do with 05+ years. I wonder if this module is attached to the alt or somewhere else?!?