Alternator amps

[DFlynn]

So, after checking a bunch of connections and testing the battery and alternator which both tested good. still had problem. I really felt it was an intermittent problem with alternator and it just wasn't happening when they tested it. Luckily, I convinced the staff at O'reilly's and they warrantied it and gave me a new one. Problem solved. Thanks to all for replies.

So, after checking a bunch of connections and testing the battery and alternator which both tested good. still had problem. I really felt it was an intermittent problem with alternator and it just wasn't happening when they tested it. Luckily, I convinced the staff at O'reilly's and they warrantied it and gave me a new one. Problem solved. Thanks to all for replies.

Could you tell the part# of alternator you got from Oriely's?

 

[devildogcummins]

bump, have the same alternator and cant find one local

 

[edgephoto]

My '87 GMC has the same alternator. The model is a 12Si. They came in a few amp ratings but all were physically the same size. So go with a 94amp unit. I recommend Bosch AL559N. It is new and carries a lifetime warranty. You will have to swap the pulley.

CS130 alternators are great but they are not a bolt in replacement. You would need to modify your brackets. Personally I don't think it is worth it.

Lastly, if your truck has a smaller capacity alternator you will need to replace the wire going to the stud on the back of the alternator to handle the extra current.