Alternators on 390
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Postmaster
Joined: Jan 2003
Posts: 3,775
Likes: 2
From: Conway Arkansas
Alternators on 390
I'm going to post this in the FE and the 61-66 Forum
As it has a bit to do with both of them I think
If your looking to upgrade your alternator to one with a built in regulator, and you don't want to buy brackets to relocate and the expense of a one wire alternator... Here's how I did it.
I had a 91 Ford Tempo 4 cylinder... I wrecked it so I was parting it out.
Out of curiousity I put it on my 66 F-100 with a 390 motor
It bolted up just fine.
It has 4 wires to it...
2 of them have power all the time, one has power with a switch, and the 4th one is a jumper on the alternator (factory)
If your interested in how to make a 2 wire setup with an alternator like this I can post descriptions, or you can email me.
Just trying to help, But I found this very helpful
As it also moved the alternator towards the left of the motor, away from the heat of the motor, and was cheaper than buying a expensive 1 wire GM product, and relocating brackets.
I tried using a regular GM alternator before but it had clearance problems with the heads.
But anyways, to make a long story short... Im very happy with this setup, and if your interested email me or I can post the instructions here.
As it has a bit to do with both of them I think
If your looking to upgrade your alternator to one with a built in regulator, and you don't want to buy brackets to relocate and the expense of a one wire alternator... Here's how I did it.
I had a 91 Ford Tempo 4 cylinder... I wrecked it so I was parting it out.
Out of curiousity I put it on my 66 F-100 with a 390 motor
It bolted up just fine.
It has 4 wires to it...
2 of them have power all the time, one has power with a switch, and the 4th one is a jumper on the alternator (factory)
If your interested in how to make a 2 wire setup with an alternator like this I can post descriptions, or you can email me.
Just trying to help, But I found this very helpful
As it also moved the alternator towards the left of the motor, away from the heat of the motor, and was cheaper than buying a expensive 1 wire GM product, and relocating brackets.
I tried using a regular GM alternator before but it had clearance problems with the heads.
But anyways, to make a long story short... Im very happy with this setup, and if your interested email me or I can post the instructions here.
Thread Starter
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Postmaster
Joined: Jan 2003
Posts: 3,775
Likes: 2
From: Conway Arkansas
Ok there's 4 wires coming into the alternator.
1 big one, and 3 little ones.
1 big one is a stud, the other 3 are a plug type.
There is also one small plug on the alternator
Run a big all time power wire into the Stud on the alternator.
From there run a small jumper wire to the First spot on the "plug"
The second one jumps to the single plug on the alternator
The 3rd is ran to a keyed switch.
I will post a picture in a second
1 big one, and 3 little ones.
1 big one is a stud, the other 3 are a plug type.
There is also one small plug on the alternator
Run a big all time power wire into the Stud on the alternator.
From there run a small jumper wire to the First spot on the "plug"
The second one jumps to the single plug on the alternator
The 3rd is ran to a keyed switch.
I will post a picture in a second
Postmaster
Joined: Jul 2003
Posts: 3,934
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From: iowa
i just got done replacing my alternator but i didn't have any tempo alternators around. Too bad!
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Postmaster
Joined: Jan 2003
Posts: 3,775
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From: Conway Arkansas
I just so happened to have the Tempo
Got it for 100 bucks.... Drove it, tranny pan gasket went out.
Then somehow a rear wheel got bent. So Im trashing it, after I put the gastank, alternator, power streering pump, radiator, etc and seats in my truck.
Thanks for the compliment on the diagram.
I don't know the amperage off top of my head but I can find out if I knew how to get it
Im thinking its a 65 or a 85 amp
ITs on a fuel injected car, all I know.
I can figure it out if you guys can tell me how, or if I go to a parts store soon
Got it for 100 bucks.... Drove it, tranny pan gasket went out.
Then somehow a rear wheel got bent. So Im trashing it, after I put the gastank, alternator, power streering pump, radiator, etc and seats in my truck.
Thanks for the compliment on the diagram.
I don't know the amperage off top of my head but I can find out if I knew how to get it
Im thinking its a 65 or a 85 amp
ITs on a fuel injected car, all I know.
I can figure it out if you guys can tell me how, or if I go to a parts store soon
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Post Fiend
Joined: Jun 2002
Posts: 13,873
Likes: 3
From: Atlanta GA
> How high an amperage alternator can the old wiring
> harnesses take
Just replace the cable from the battery to the alternator with a 4 gauge wire and you should be okay. I am only running a 65 amp alternator so I repalced mine with a 6 gauge wire.
You can buy bulk cable from NAPA and West Marine. I put my cable terminals on with a bench vise and a large pipe to the handle to collapse the new lugs to the cable.
> harnesses take
Just replace the cable from the battery to the alternator with a 4 gauge wire and you should be okay. I am only running a 65 amp alternator so I repalced mine with a 6 gauge wire.
You can buy bulk cable from NAPA and West Marine. I put my cable terminals on with a bench vise and a large pipe to the handle to collapse the new lugs to the cable.