GM Alternator upgrades

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07-27-2010, 08:06 PM

Lowrolla'

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Join Date: Jul 2010

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GM Alternator upgrades

I need to upgrade my stock 105 amp alternator, I see that Napa has a 140 amp unit listed for my truck (1998 GMC C1500 5.7). Does anyone know if it is a bolt on? Or of any other options for more amperage?

07-31-2010, 08:45 PM

Lowrolla'

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Anyone have any suggestions? Wrong forum?

07-31-2010, 11:00 PM

Sinemeup

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Join Date: Apr 2006

Posts: 633

How much current draw will you have? Is the battery/wiring already upgraded?

07-31-2010, 11:35 PM

Lowrolla'

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Join Date: Jul 2010

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The spec max current draw for both my amps is 150 amps, and my current alternator is rated for 105 amps. I will be running dual batteries and will upgrade the big 3 before I reinstall the big amp ( had to go in for warranty repairs).