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105A or 145A alternator?

Tiny
BRENTULRICH88
  • MEMBER
  • 2003 CHEVROLET AVALANCHE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 145,000 MILES
Hello,

I need to replace my alternator, however, it doesn’t say on bad one what amperage it is. Will it hurt if it’s a 105 and I just install a 145? Please advise, and if it does need to be that specific amp where would I be able to locate it.

Thanks
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Friday, September 17th, 2021 AT 5:36 AM

3 Replies

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

You want to make sure that the replacement alternator has the same output as the one in your vehicle. So if you have a 105A that is what you will need to install.

The best way to know what came in your vehicle from the factory is to call the dealer and provide them with your VIN. They can tell you what is the part number and the Amp rating that was installed from the factory.

https://www.2carpros.com/articles/how-to-replace-an-alternator

Please let me know of any questions.
Thank you.
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Friday, September 17th, 2021 AT 10:25 AM
Tiny
BRENTULRICH88
  • MEMBER
  • 37 POSTS
So I ended up taking bad one to parts store and they put a 105 and 145A side by side and it was clearly a 105. 145 was way bigger, lol.
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Friday, September 17th, 2021 AT 10:27 AM
Tiny
SQM
  • MECHANIC
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Glad you got it figured out. The 145 does have heavier gauge components so it is bigger.
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Friday, September 17th, 2021 AT 10:34 AM

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