dual pully alternator

Reply Subscribe

Thread Tools

Search this Thread

Jul 19, 2003 | 04:17 PM

lsrjf

Thread Starter

Junior User

Joined: Nov 2001

Posts: 75

Likes: 0

From: alabama

dual pully alternator

I have bought a 70 crew cab truck that has an alt. that has dual pulleys on it and i am wanting to put air on this truck is it necessary for the alt. to have both belts for it to pull the alt. there shouldnt be that much load on the alt. should there. and also does anyone have a diagram of how the belts are supposed to go to run the a/c

Thanks Jeff

Last edited by lsrjf; Jul 19, 2003 at 04:20 PM.

Jul 19, 2003 | 06:03 PM

moonley

Senior User

Joined: Jul 2003

Posts: 425

Likes: 3

dual pully alternator

One belt should be fine for the alternator as long as it isn't much over 60 amp output (less drag). I ran across a thread that discussed this earlier, try searching for it.

Jul 19, 2003 | 06:13 PM

lsrjf

Thread Starter

Junior User

Joined: Nov 2001

Posts: 75

Likes: 0

From: alabama

dual pully alternator

Ok well my truck does have the dual battery setup i had assumed that it was something that someone had added but maybe it was from the factory that would explain it having a high output alt. so i guess that i will try and run it with just one belt so that i can get my a/c working an besides i dont use the two battery set up anyway.

Thanks Jeff

Jul 19, 2003 | 06:56 PM

moonley

Senior User

Joined: Jul 2003

Posts: 425

Likes: 3

dual pully alternator

I am putting dual batteries in my truck, as well as an on board air compressor and power steering. I used to have a double pulley on the alternator, but due to the add-ons I will have to reduce this to one. I am not too worried about it. Just run good belts, and if you have problems with burning them off the alternator, you could get a bigger diameter pulley to put on it from a junk yard.

Jul 20, 2003 | 03:01 AM

Like M. Fords

Elder User

Joined: Jun 1999

Posts: 940

Likes: 0

From: LAT 46.55501° & LON -122

dual pully alternator

When I had AC on my '69 F250 (390), the crank had a total of 4 pulleys. Two for the water pump/alternator, one for the power steering, and one for the AC. Would it be easier to just add a pulley to the crank?