Alternator Upgrade

JD1964 · Sep 2, 2013

A local pick and pull yard in my area has a good selection of cars and truck to scavenge from. I hear forum members here taking about 3G alternator upgrades. Is this something I can do by scavenging parts from other vehicles? If so, which model years and models are good donors?

Rick 91GT · Sep 2, 2013

94-95 mustang has a 3g...

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jrichker · Sep 2, 2013

See http://www.stangnet.com/mustang-forums/threads/3g-alternator-install-a-how-to.646825/#post-6673702 for installation instructions,. You may need to scroll down a few posts to see the diagrams I posted.

and

http://www.mustangcentral.net/tech/alternator.html for pictures that show the minor modification to the alternator mount.

mofoe87Gt · Sep 25, 2013

Why can't you use your original harness,instead of having to buy a 4gage wire and etc.

mikestang63 · Sep 25, 2013

mofoe87Gt said:
Why can't you use your original harness,instead of having to buy a 4gage wire and etc.

Because the original harness is a fire hazard with the stock unit, and cannot handle the added amperage. Spend the money for the correct wire with a 150 amp watertight megafuse holder. Is your car not worth $40 to do it right?

Any 94-95 Mustang- V6 or Gt 3g alternator will fit. All that is needed is some minor trimming of the alt bracket. Picked one up from my JY for $30 and it is running fine a year later. If you want a new one, buy one online from Advanced Auto with the code TRT30 and you are about $80 for the alt. Add another $40 for the correct wire kit and you are done. Bought mine from a guy on the Corral, already crimped with everything needed, except an additional 4g ground wire which you also need to add.

Follow Jrichker's links for proper install.

Mustang5L5 · Sep 25, 2013

mofoe87Gt said:
Why can't you use your original harness,instead of having to buy a 4gage wire and etc.

The two 10g wires in parallel are not large enough to handle the potential current from a higher output alternator. High amps through undersize wire creates heat. Hot wires create fire sometimes.

Look into 6G alternators. Smaller case, more compact, same wiring, newer. Comes from a 2004 V6 Mustang. It's only 105A, but you don't need 130A on a Mustang unless you are running some crazy stereo system or 9 TV's. My daily driver G35 has a 120A alternator, and it runs way more electrical equipment than the average 5.0 fox.

madspeed · Sep 25, 2013

4 gage power wire that sucker to prevent any fire hazard, and no underdrive pulleys

mofoe87Gt · Sep 25, 2013

I have 3g alternator already, I'll do the 4gage wiring I was just curious, but im running crank pulley

mofoe87Gt · Sep 25, 2013

I also have a alternator pulley

85rkyboby · Sep 25, 2013

Is it any different to put 3g on a 85?

mikestang63 · Sep 25, 2013

85rkyboby said:
Is it any different to put 3g on a 85?

No. You do not need to cut any existing wiring. Just tap into the stator wire in the stock plug, solder it, and tape the whole plug off and tuck it away. You will reuse the existing D shaped plug.

mikestang63 · Sep 25, 2013

mofoe87Gt said:
I have 3g alternator already, I'll do the 4gage wiring I was just curious, but im running crank pulley

FWIW, I have run U/D pulleys on several cars with no issues. As long as you are not running a race crank pulley IMO you will be fine.

85rkyboby · Sep 25, 2013

Thanks @mikestang63 you the man

Mustang5L5 · Sep 25, 2013

I run underdrives on my car as well. I purchased an ASP 1 7/8 Overdrive alt pulley to compensate though

mofoe87Gt · Sep 25, 2013

mikestang63 said:
No. You do not need to cut any existing wiring. Just tap into the stator wire in the stock plug, solder it, and tape the whole plug off and tuck it away. You will reuse the existing D shaped plug.

so you used the same wiring nothing burned or any problems?

madspeed · Sep 25, 2013

should clarify, I meany dont run underdrive pulley on the alternator

mikestang63 · Sep 25, 2013

mofoe87Gt said:
so you used the same wiring nothing burned or any problems?

Use the same 4g wire setup as for the 87-93

mofoe87Gt · Sep 25, 2013

Can you post a picture of how you have it setup please,thanks

mikestang63 · Sep 25, 2013

mofoe87Gt said:
Can you post a picture of how you have it setup please,thanks

Do a search.. there are many writeups.

JD1964 · Sep 25, 2013

I bought the kit from LMR that had the 4g power cable. Damn that's a fat muther. Everything's in and charging great!

Alternator Upgrade

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there is enough sticking out to grab on to

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