I've gotten quite a few PMs over the past month or two about serpentine conversions, and figured I'd make a thread for it. One of the most commonly available setups is off the late '80s-early '90s GM full size and S-Series trucks - must be a 4.3 if from an S-truck, won't matter with a full size because brackets are the same. Be sure to get the aluminum bracketry, the steel 'horseshoe' design (early serpentine) may cause steering gear interference (round cover gears should clear ok, the pulley may contact the right rear corner of the 4-bolt cover box - looking at it from the driver's seat).
A/C: If you come across one with an air pump, don't fret, you can leave it out, especially if you're not using a/c. You'll also notice the a/c-bypass idler pulley, these are available from Autozone, etc. for somewhere around $35 if you don't plan to use a/c, or it's not currently in the budget.
http://www.autozone.com/autozone/parts/Motormite-A-C-Compressor-Bypass-Pulley/1993-GMC-K1500-1-2ton-Sub-4WD/_/N-izsa7Z91tb7?counter=0&filterByKeyWord=pulley&fromString=search&itemIdentifier=593937_0_0_
If you do have a/c or plan to use it, you'll notice there is a boss just below where the compressor would go, this is for an idler pulley to ensure more pulley contact with the belt. Mine didn't have one to start with, but I believe this is the one required:
http://www.autozone.com/autozone/parts/Duralast-Idler-Pulley/1993-GMC-K1500-1-2ton-Sub-4WD/_/N-izsa7Z8gd4q?counter=0&filterByKeyWord=pulley&fromString=search&itemIdentifier=634072_0_0_5281
It's simply listed as an 'idler' pulley, and the routing will simply look like this:
Alternator: My setup is from a '94 which uses the newer style (internal fan) alternator, I'm not 100% sure if this bracket interchanges with the slightly older SI alternators. Also be sure to wire either a 10-ohm, 25-watt resistor, or keep the alternator/battery bulb for your dash wired in line with the brown wire that plugs into the rear of the alternator, otherwise you risk burning it up (a faulty bulb/connection here can also cause the alternator to not work to start with, causing you to chase your tail).
Water pump: Get a reverse-rotation pump for a 4.3 S-truck, or one of the '88-'95 trucks, later years use a different type of snout (the pulley bolts over a threaded snout like normal, and the radiator fan threads onto the pump snout... not to mention they're a lot more expensive than the '88-'95 pumps).
More to come... probably. People have swapped serpentine setups from other vehicles (Camaro/Firebird/Caprice/Roadmaster/etc.) as well, so if you have info on those cars, feel free to post!
A/C: If you come across one with an air pump, don't fret, you can leave it out, especially if you're not using a/c. You'll also notice the a/c-bypass idler pulley, these are available from Autozone, etc. for somewhere around $35 if you don't plan to use a/c, or it's not currently in the budget.
http://www.autozone.com/autozone/parts/Motormite-A-C-Compressor-Bypass-Pulley/1993-GMC-K1500-1-2ton-Sub-4WD/_/N-izsa7Z91tb7?counter=0&filterByKeyWord=pulley&fromString=search&itemIdentifier=593937_0_0_
If you do have a/c or plan to use it, you'll notice there is a boss just below where the compressor would go, this is for an idler pulley to ensure more pulley contact with the belt. Mine didn't have one to start with, but I believe this is the one required:
http://www.autozone.com/autozone/parts/Duralast-Idler-Pulley/1993-GMC-K1500-1-2ton-Sub-4WD/_/N-izsa7Z8gd4q?counter=0&filterByKeyWord=pulley&fromString=search&itemIdentifier=634072_0_0_5281
It's simply listed as an 'idler' pulley, and the routing will simply look like this:
Alternator: My setup is from a '94 which uses the newer style (internal fan) alternator, I'm not 100% sure if this bracket interchanges with the slightly older SI alternators. Also be sure to wire either a 10-ohm, 25-watt resistor, or keep the alternator/battery bulb for your dash wired in line with the brown wire that plugs into the rear of the alternator, otherwise you risk burning it up (a faulty bulb/connection here can also cause the alternator to not work to start with, causing you to chase your tail).
Water pump: Get a reverse-rotation pump for a 4.3 S-truck, or one of the '88-'95 trucks, later years use a different type of snout (the pulley bolts over a threaded snout like normal, and the radiator fan threads onto the pump snout... not to mention they're a lot more expensive than the '88-'95 pumps).
More to come... probably. People have swapped serpentine setups from other vehicles (Camaro/Firebird/Caprice/Roadmaster/etc.) as well, so if you have info on those cars, feel free to post!