3G alternator part #
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Mountain Pass
Joined: Apr 2011
Posts: 181
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From: NEW ZEALAND
3G alternator part #
Hi , I am building a new motor for my 86 F150 , a 351w to 385 ci , 74 block 1990 front serpentine drive and A/C etc it has a 2G alternator i think and want to upgrade to the 3G i have heard there are two types with different bolt centers can anyone give me the right number that fits my 1990 f150 brackets .
Cheers .
Cheers .
Lead Driver
Joined: Apr 2007
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From: Houston
Hard to say, I am dealing with the same thing on my '82. There are two different things you have to consider. first is case size, there is a small case 95A alternator, then there is the large case 130A alternator. Then there is a 7" pivot mount which is what you will use with a serpentine belt setup from what I have read, then there is the 8" pivot mount which is supposed to be for V belts.
Some plates cite the 95A 3G has a 7" and 8" pivot variants but every alternator shop I talked to said they never had a different spacing for the 95A. The 130A does how ever.
Some plates cite the 95A 3G has a 7" and 8" pivot variants but every alternator shop I talked to said they never had a different spacing for the 95A. The 130A does how ever.
Lead Driver
Joined: Apr 2007
Posts: 5,958
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From: Houston
This is one 7" pivot mount option that will bolt onto your mount.
https://www.dbelectrical.com/product...-302ci-v8.html
This is the one I am looking at for my truck as I need the 8" pivot for my V belt equipped truck.
https://www.dbelectrical.com/product...-92-93-94.html
You wont be able to run this one as its the 8" pivot but if you wanted 130A there is a 7" pivot with 130A output which is this one here.
https://www.dbelectrical.com/product...bus-92-99.html
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Mountain Pass
Joined: Apr 2011
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From: NEW ZEALAND
Alt
Thank you , thats great , for the price difference 130a will be nice , ecus like good power . . Now we need to get rid of this Virus and get you guys back to work so i can buy some parts . Cheers.
Lead Driver
Joined: Apr 2007
Posts: 5,958
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From: Houston
130A is good if you have a serpentine belt that wont slip. it sucks if you have to run 130A and have a V belt.
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Tuned
Joined: May 2015
Posts: 318
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From: Baltimore
I'm using a 3G with a single v belt and upon start up the belt would slip and squeal. Changed the regulator to one that has soft start ( allows amperage to increase slowly for a few seconds ) and took care of the problem. My truck is bare bones with no A/C or power anything so I really didn't need the 3G. Only changed it to get rid of the plug in connector that fails on the 2G.
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Tuned
Joined: Sep 2013
Posts: 453
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From: Little Rock, AR
Here's a handy reference with PNs and applications: 3G Conversion - Gary's Garagemahal (the Bullnose bible)
Lead Driver
Joined: Apr 2007
Posts: 5,958
Likes: 105
From: Houston
Here's a handy reference with PNs and applications: 3G Conversion - Gary's Garagemahal (the Bullnose bible)
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Mountain Pass
Joined: Apr 2011
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From: NEW ZEALAND
Hi Rusty , thanks again for the 3g alternator link , i see that listing is for large trucks and on that photo if correct shows 2 vee pulley , do you know if the 7" center lugs is the same as a 95 mustang 130a, nice bosch one at rockauto?
Lead Driver
Joined: Apr 2007
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From: Houston
For the large case 130A 3G alternator one way to tell if its a 8" or 7" pivot is by looking at the threaded ear. the 8" pivot has a recessed cut into the ear with a reinforcement bar. The 7" pivot does not have this recessed cut into the ear and the ear mounts close to the case.
