Fox Body Alternator on a Classic?

jb1dsl · Feb 12, 2007

I have a fox body alternator and was wondering does anyone use these on the classics? Do they have more amps? How simple are they to install? Does anyone have instructions or diagrams? I have heard of using 3g's and one wire alts but was wondering if this was an upgrade? I know you will be able to get rid of the voltage reg if these are used.

rhyno9 · Feb 12, 2007

jb1dsl said:
I have a fox body alternator and was wondering does anyone use these on the classics? Do they have more amps? How simple are they to install? Does anyone have instructions or diagrams? I have heard of using 3g's and one wire alts but was wondering if this was an upgrade? I know you will be able to get rid of the voltage reg if these are used.

It's an upgrade with regard to amp output.

I wouldn't go with a 2g on my car because of the fire hazzard issues. I would step up the 3g just to be on the safe side.

http://fordfuelinjection.com/?p=75

jb1dsl · Feb 12, 2007

I just had it on hand and was wondering, what is the fire hazard?

jb1dsl · Feb 12, 2007

i was debating using it or taking the pulley off and putting on my stock alternator (66 289).

rhyno9 · Feb 12, 2007

jb1dsl said:
I just had it on hand and was wondering, what is the fire hazard?

There is a TSB on it and that in and of itself tells me that it has to be a real problem. Ford doesn't issue a TSB unless they absolutely have to. It has to do with the wiring overheating.

Like I said I just wouldn't bother since the 3gs (from the taurus) are so plentiful.

jb1dsl · Feb 12, 2007

How do i identify a 2g,3g, or 4g.
Can anyone ID this alternator, I believe it is from a fox body?
The numbers on it:
top side: X75A E7ZFFA F 07 9 B

Front (pulley side): 21

Back: 30

rhyno9 · Feb 12, 2007

jb1dsl said:
How do i identify a 2g,3g, or 4g.
Can anyone ID this alternator, I believe it is from a fox body?
The numbers on it:
top side: X75A E7ZFFA F 07 9 B

Front (pulley side): 21

Back: 30

Take a look at the link below. All kinds off info which should help. Off the top of my head I would say that if it has a fan on the pulley then it's a 1g or 2g.

http://fordfuelinjection.com/?p=63

jb1dsl · Feb 12, 2007

yeah it has a fan and a plastic shield on the top

RMODEL65 · Feb 12, 2007

look for an alternator off of a 1993and up lincoln mark8 they are 3g(130amp alternators)

Rusty67 · Feb 12, 2007

If you use a thicker gauge wire I think that would take care of the wire overheating. If you need a new alternator and you have one that will work, why not ? Altho, I recomend going to the 3g alternator as it is far superior and will put out more power with less load on the engine.

bnickel · Feb 13, 2007

the 2G looks more stock than the 3G and a lerger gauge wire would cure the overheating issue. if it just want better performance and don't care about the looks a 3G would be the better option but if you want to retain a semi-stock look the 2g would be good.

68EFIvert · Feb 13, 2007

I purchased a harness adapter from Mustangs Plus when I did an EFI conversion. It was a harness that adapted the original alternator wiring plug on your car to the fow 2g alternator . I think it was made by Ron Morris. It was a nice piece and made it real easy. Now that I have said that, I just converted to 3g using the wiring kit from fordfuelinjection.com because I need the extra juice for a new stereo. I should have went to 3g to start with.

351carlo · Feb 14, 2007

My setup utilizes an alternator off of an E350 Ambulance package. Same goes for the voltage regulator. Mid-80's setup rated for 100 amps. I found this was the most stock appearing with higher amperage. I will be switching to a 3g shortly however.

To cure the overheating I ran an additional 8 gauge wire to the battery. I DID have a small electrical fire when I tried to run without it. Since then I have rewired a lot of the engine harness and don't plan on having any problems.

Tim65GT · Feb 15, 2007

Here's some info that helped me when I converted to a 3G:

Rusty67 · Feb 15, 2007

Nice diagram. You can also hook the Yellow wire directly to the output terminal on the alternator itself, makes for a cleaner install and saves space on the starter motor relay.

Fox Body Alternator on a Classic?

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