302 alternator help is it 1g or 3g?

Miastang

Member
Jul 4, 2020
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Hi everyone, I bought a car with 1990 302, the car has a fair few mods from headers to transmission, I’m changing the alternator but there is not a single identification number on it?? Can someone tell me if this is a 1 or 3g alternator please, all it has is motorcraft brand name and number 2 on it!
As it’s quite modified it may be likely they upgraded alternator too and understand there is a some wiring mods when upgrading to 3G so didn’t want to get the wrong one.

many thanks in advance
 

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Mustang5L5

Put lubricant all over the balls
Mod Dude
Feb 18, 2001
36,422
12,326
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Massachusetts
3g or 6G. Hard to judge its size by the pics

Appearance mostly. The 6g is a small case version of the 3g with better cooling, but I believe they are 110A. Came on 01-04 v6 Mustangs

this list is incomplete

I believe the 86-93 mustang alt us considered a 2G alt
 

CtCarl

Active Member
Apr 27, 2002
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Southern Connecticut
FWIW, telling the 3G from the 6G when it's installed is pretty easy. If there's a stator wire, it's a 3G. If the alternator bracket is notched for clearance, it's a 3G.