Factory gm serpentine belt conversion

[979bch]

I am in the gathering process of my serpitine belt conversion I have every thing I need from  a 1994 truck my question is do I change pullys on my original alternator or do I change the plug to fit the new alternator from the 94 and do I use the water pump from the 94 or just change pullys on original as well .

[zieg85]

I would just use your existing alternator with the 94 pulley.  You will need the 94 waterpump and fan because it is reverse rotation.

[LTZ C20]

I did the same thing with my truck. The easiest thing is to wire in a new plug for the new alternator or buy of those short conversion harnesses.

Zieg, you cant swap them, the pulleys wont fit, the alternators are not the same, the old style bodies of the alternators fit brackets for v-belts, the serpentine alternator bodies are made to fit inside the serpentine brackets so the pulleys can't be switched.

All my serpentine parts are from a 1995 truck. You need to mimic the factory setup of a 94 onto your truck. So alternator, ac compressor if using ac, power steering pump, water pump (depending on direction of rotation). Just get parts for a 94.

[hatzie]

Agreed.  Use all of the 1994 parts.  ^^

The nice thing about moving to the 105A CS130 alternator from the 1994 is the automatic Amp upgrade...  even more amps are an easy upgrade from there...  The newer AD237 125A alternator is pretty close to a drop in replacement for the CS130.  They're both much higher output than the old 65-87Amp SI series.  Just get the AC Delco SI - CS exciter conversion pigtail with the resistor.

The Sanden HT6 on the V8 engines or H6 on the 4.3L are a longer lasting AC compressor than the Harrison R4.  It's much much lighter than the Harrison A6 on the earlier trucks.  It's compatible with R134a out of the box.

[zieg85]

Thanks for setting me straight.  I don't ever plan to upgrade mine, no need running stock everything.  I just knew about the reverse rotation, the rest was assumptions based on swapping pulleys from the V-6 alternator.  Thanks for the egimication...

[LTZ C20]

No problem. Every one needs a good learnin. Cuz you can't fix stupid.

[AZ87V10]

Ha ha ha! No, you can't! This upgrade is on my bucket list of potential upgrades that I'd like to make to my truck at some point in the future. Thanks for the great info on this!

[LTZ C20]

Your welcome, it was totally worth it to me, I love it.

[AZ87V10]

Oh, I loved the factory serpentine setups on my other trucks that I used to own. It's much easier to work on and is much more efficient. I always figured the swap was possible but knew it was a lot of work to do. I have other more pressing things to work on than that at the moment on the truck. Lol. Don't we all?

[LTZ C20]

Well it could have been done cheaper, but I wanted new alternator, p/s pump, ac comp, water pump, all that because it was all going on a brand new engine. Plus, I have electric fans, lots of room for activities between the fans and front of engine. Makes changing the water pump a breaze if I had too. Slide the belt off, 4 boltsfor the pulley, 4 more for the pump, and the radiator hose is easily accessible. The only thing was actually a pain in the buttons was the power steering pump. It was a little easier tho as I got the updated design pulley so it has large holes in it to access bolts. I can post pics if anyone is interested.