best alternator for the $$$

[spenser21]

so im not to thrilled about switching alternators all the time. Does anyone recommend a good alternator that's not going to cost 100s...
would be going on my 74 k10 350/350

 

[4WDKC]

Not sure what you are using that is killing alternators, but I was looking at the one on my 87 and it looks like 120-140 amp from an LT1 fbody, caprice, impala, roadmonster should bolt on factory mount, just need to adapt wiring to new plug.

 

[75gmck25]

Probably the least expensive choice is a rebuilt GM 12si (vs. your current 10si) with a single groove pulley. The max rating for a stock 12si is 94 amp capacity. You should upgrade the charge wire to handle the higher amps, but the rest of your stock wiring will plug right in to a 12si.

Bruce

 

[spenser21]

thanks guys, still chasing problems but I only want to replace stuff once lol

 

[fussfeld]

i think delco Remy is good.

 

[77 K20]

Probably the least expensive choice is a rebuilt GM 12si (vs. your current 10si) with a single groove pulley. The max rating for a stock 12si is 94 amp capacity. You should upgrade the charge wire to handle the higher amps, but the rest of your stock wiring will plug right in to a 12si.

Bruce

That is what I did. The 12si puts out a LOT more amps at low RPM compared to a 10si. The 12si unit has some upgraded cooling capability. New fan on the front and some more open vents at the rear.

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[Honky Kong jr]

What alternator amp wise or designation would have came on a fully loaded 87 Silverado with power windows? Sorry for the interjection.

 

[MikeB]

I've had a 12SI rebuilt by AC Delco in a 69 C10 for around 12-14 years. Go here to find the P/N, and then check out Amazon and Rock Auto for prices. http://parts-catalog.acdelco.com/catalog/catalog_search.php


My 82 C10 has a rebuilt 10SI alternator from O'Reilly Auto. Looked like new when I bought it, and and has a lifetime warranty. So you might want to see if any of your local parts stores offer a lifetime warranty.

 

[bucket]

What alternator amp wise or designation would have came on a fully loaded 87 Silverado with power windows? Sorry for the interjection.

Should have been a 105 amp CS130 style with a 5-groove serpentine style pulley.

 

[Honky Kong jr]

Should have been a 105 amp CS130 style with a 5-groove serpentine style pulley.

Ok so that would be a pretty decent one then?

 

[bucket]

Ok so that would be a pretty decent one then?

Jep. I've put a couple of them into older squares as an upgrade. A 140 amp CS144 can work also.

 

[Honky Kong jr]

Jep. I've put a couple of them into older squares as an upgrade. A 140 amp CS144 can work also.

I have one from an 86 454 that came out of a motor home that was V belt but had the plastic fan like my 87 one does. It’s gotta handle my fan, distributor and fuel pump it should be fine the 87 one that is

 

[Rusty Nail]

@HonkeyKongjr
I use the "cs130"? -105 amp- for a 1986 Corvette. That's cheap and has a lifetime warranty.
Buy that plug thingy, swap pulleys and it bolts up NP.

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There's the part numbers. Pictured is my salvage yard core and the Borg-Warner pigtail. I had change off my Ben to buy lunch! ...at 7-11... but lunch none-the-less!

 

[Hatchet54]

How about this thing? Yay or nay?

https://www.amazon.com/ACDelco-334-2112A-Professional-Alternator-Remanufactured/dp/B002QVHMZ2/ref=sr_1_1?s=automotive&ie=UTF8&qid=1551116944&vehicle=1977-48-530-546---8-8-1364--3--1093--2-0&sr=1-1&ymm=1977:gmc:k15#

(I've got an Amazon gift card I'm trying to utilize the best I can)

 

[Hatchet54]

So is the 12si pretty preferred over the 10?

I've found a couple options on Amazon, somebody mind taking a look and giving me advice which to get?

https://www.amazon.com/dp/B007QBRAM...olid=3O06EA8K55J6B&psc=0&ref_=lv_ov_lig_dp_it

https://www.amazon.com/dp/B00SG0K5E...olid=3O06EA8K55J6B&psc=0&ref_=lv_ov_lig_dp_it