Serpentine belt and Alternator Size

[xTheOlahx]

I currently Have a 2002 Yukon SLT 5.3L. I want to replace my serpentine belt although upon further research there are 2 different belts for different alternator sizes.
I had looked and currently the previous owner replaced the alternator with a Toughone 91602 alternator which when looking that part number up it shows that it's a 105 amp alternator.
In my RPO codes it shows that I have a KG8 (130 amp alternator). It currently has a Dayco 5060830 serpentine belt. So my question is do I get the belt for the 130 amp alternator or the 105 amp?

 

[Stick]

I'd stick with what's in it and has been since you acquired it. Probably a safe bet.

 

[mizzouguy]

Youll have to get the belt for the smaller alt if he put a 105 amp one in it. Its shorter. When that alt fails, then replace it with a 130 and the proper belt for that alt.

 

[xTheOlahx]

Youll have to get the belt for the smaller alt if he put a 105 amp one in it. Its shorter. When that alt fails, then replace it with a 130 and the proper belt for that alt.

Thanks, I didn't realize they used different sized pulley's for the different alternator sizes. Wish they would of replaced it with the 130 amp alternator.

 

[mizzouguy]

Actually, the pulley is the same but the higher amp alt is actually physically larger, with a bigger case. Uses the same mounting brackets tho. So the pulley on the bigger alternator sits farther up and to the right, looking at the front of the engine, relative to where the pulley would sit with the smaller alternator. If you put the longer belt on with the smaller alt, if the tensioner can't make up for the slack it'll be really loose lol.