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130amp to 105amp alternator

drumset5994

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drumset5994 Enthusiast

drumset5994

Posted
Posted

My truck came stock with a 130amp. However, they are massively expensive.

 

Has anyone ever just put in a 105 amp alternator? Im just curious to see how good they run, if they work at all. Alot of the 4.3L V6 Alternators on the Blazer/Jimmy line are 105 amp, and they have the same connector/look as mine (130 amp)

kdm101 Enthusiast

kdm101

Posted
Posted

Yes you can do it. I went the reverse by putting a 145A alternator in place of my stock 105A unit. The only change I did was to get a longer belt - all mountings and plugs were identical.

 

I just re-read your post and was thinking you had a V8. You have a 4.3 with a 130A alternator? That's unusual since it was optional on the V8 models. Still, I suspect that you could swap the unit with out having to make any modifications other than a new belt.

Cadha13 Enthusiast

Cadha13

Posted
Posted

Do you have the electric fans on your truck? If you do you need the 130 Amp alternator to provide the extra current. My 2005 GMC 4.3L has electric fans and has a 130 Amp alternator standard. Those fans move a lot of air and need that extra current to keep the truck cool and to prevent battery drain.

redvett Senior Enthusiast

redvett

Posted
Posted

If the MFR put a 130a on thats what is needed dont be cheap you will pay for it in driveability & performance especially if you have a 3:23 axle.

As for the electric fans i have a 130a with GM fans with no problems.

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