3g alt. upgrade

91foxhatch5.0 · July 9th, 2007, 01:41 PM

what all do i need to switch my 2g over to a 3g?

terribleonexx88 · July 9th, 2007, 01:44 PM

http://www.corral.net/tech/maintenance/130a-tech.html

91foxhatch5.0 · July 10th, 2007, 10:52 AM

got another ??, can i run a u/d pulley on the 3g and still run an electric fan

JBIGBOOTSY · July 10th, 2007, 11:23 AM

it depends where you get the alt. I got mine from autozone and the pully that came on it was huge. I swapped it out for the one on my old alt. I had to have about .125 milled of the back of the old pully yo fit the new alt. Now I have full charge at 600 rpm.

91foxhatch5.0 · July 10th, 2007, 11:25 AM

im thinkin mine is the original alt. i work at a junkyard and i got one off a 95 thunderbird

Mikes88 · July 10th, 2007, 11:27 AM

all you need is a new wire harness. You shouldnt use the same one (fire). I found mine at 50resto.com. Get the power wire too. It reduses the noise a little. Good luck.

91foxhatch5.0 · July 10th, 2007, 11:51 AM

i got the wiring off the same car...would this work also

91foxhatch5.0 · July 17th, 2007, 08:58 AM

well i got her installed last night...it was ALOT easier than i thought it would be...thanks for all the info guys

mikebert · July 17th, 2007, 09:52 AM

You'll need a smaller pulley if you run underdrive and electric fan, like Bootsy said. Really if you run underdrive at all - I have a manual trans and when I didn't run a smaller pulley I would stall the engine if I tried to ease out of a light without giving it some gas. It's being a little lazy, but the voltage would drop so low that I'd lose the spark.

I'm not afraid to give her some gas

, but I love knowing that I have enough torque to start rolling at an idle.

91foxhatch5.0 · July 17th, 2007, 11:46 AM

the pulley on the 3g is the same size as the underdrive pulley on my old 2g...how do i get a smaller pulley

mikebert · July 17th, 2007, 09:48 PM

Originally Posted by 91foxhatch5.0

the pulley on the 3g is the same size as the underdrive pulley on my old 2g...how do i get a smaller pulley

Not sure, there was a local aftermarket place that knew exactly what we needed as soon as we said "Mustang", "underdrive" and "alternator". Do you have any speed shops around that could order stuff like that for you?

91foxhatch5.0 · July 18th, 2007, 08:25 AM

i order my parts off 50resto.com

JBIGBOOTSY · July 18th, 2007, 09:42 AM

some 3g alternators have a large pully, and some have a small pully. If yours has the same pully dia. as your stocker than you should be ok.

July 9th, 2007, 01:41 PM	#1
91foxhatch5.0 Regular 1991 mustang lx 5.0 14.5@92 Join Date: Nov 2006 Location: welcome, nc Posts: 131	3g alt. upgrade what all do i need to switch my 2g over to a 3g?

July 9th, 2007, 01:44 PM	#2
terribleonexx88 Enthusiast Join Date: Oct 2006 Location: new england Posts: 817	http://www.corral.net/tech/maintenance/130a-tech.html __________________ 85 svo. work in progress

July 10th, 2007, 11:23 AM	#4
JBIGBOOTSY MM Fanatic 1990 LX hatch Join Date: Aug 2006 Location: Hobart Indiana Posts: 3,595	it depends where you get the alt. I got mine from autozone and the pully that came on it was huge. I swapped it out for the one on my old alt. I had to have about .125 milled of the back of the old pully yo fit the new alt. Now I have full charge at 600 rpm. __________________ Bolt-on Abraham Lincoln Log motor. With extra wiring.

July 18th, 2007, 09:42 AM	#13
JBIGBOOTSY MM Fanatic 1990 LX hatch Join Date: Aug 2006 Location: Hobart Indiana Posts: 3,595	some 3g alternators have a large pully, and some have a small pully. If yours has the same pully dia. as your stocker than you should be ok. __________________ Bolt-on Abraham Lincoln Log motor. With extra wiring.

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July 10th, 2007, 10:52 AM	#3
91foxhatch5.0 Regular 1991 mustang lx 5.0 14.5@92 Join Date: Nov 2006 Location: welcome, nc Posts: 131	got another ??, can i run a u/d pulley on the 3g and still run an electric fan

July 10th, 2007, 11:25 AM	#5
91foxhatch5.0 Regular 1991 mustang lx 5.0 14.5@92 Join Date: Nov 2006 Location: welcome, nc Posts: 131	im thinkin mine is the original alt. i work at a junkyard and i got one off a 95 thunderbird

July 10th, 2007, 11:27 AM	#6
Mikes88 Newbie 1990 HATCH 12.56@118 Join Date: Oct 2006 Posts: 27	all you need is a new wire harness. You shouldnt use the same one (fire). I found mine at 50resto.com. Get the power wire too. It reduses the noise a little. Good luck.

July 10th, 2007, 11:51 AM	#7
91foxhatch5.0 Regular 1991 mustang lx 5.0 14.5@92 Join Date: Nov 2006 Location: welcome, nc Posts: 131	i got the wiring off the same car...would this work also

July 17th, 2007, 08:58 AM	#8
91foxhatch5.0 Regular 1991 mustang lx 5.0 14.5@92 Join Date: Nov 2006 Location: welcome, nc Posts: 131	well i got her installed last night...it was ALOT easier than i thought it would be...thanks for all the info guys

July 17th, 2007, 09:52 AM	#9
mikebert Enthusiast Join Date: Oct 2006 Location: Augusta, GA Posts: 906	You'll need a smaller pulley if you run underdrive and electric fan, like Bootsy said. Really if you run underdrive at all - I have a manual trans and when I didn't run a smaller pulley I would stall the engine if I tried to ease out of a light without giving it some gas. It's being a little lazy, but the voltage would drop so low that I'd lose the spark. I'm not afraid to give her some gas , but I love knowing that I have enough torque to start rolling at an idle.

July 17th, 2007, 11:46 AM	#10
91foxhatch5.0 Regular 1991 mustang lx 5.0 14.5@92 Join Date: Nov 2006 Location: welcome, nc Posts: 131	the pulley on the 3g is the same size as the underdrive pulley on my old 2g...how do i get a smaller pulley

July 18th, 2007, 08:25 AM	#12
91foxhatch5.0 Regular 1991 mustang lx 5.0 14.5@92 Join Date: Nov 2006 Location: welcome, nc Posts: 131	i order my parts off 50resto.com

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