Upgrading alternators
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4wd Low
Joined: Apr 2025
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Likes: 3
Upgrading alternators
1980 F250 with the inline 6, and I want to upgrade my alternator from a 35A to a 70A. Is it as easy as swapping the alternators out? Or is there more involved? Do I have to mess with the starter solenoid? I’m going to be running dual batteries and an 85A isolator, too, if that helps. I’ve read somewhere that I need to get a bigger charge cable? I’m not sure. Any help is appreciated. TIA
Lead Driver
Joined: Jun 2013
Posts: 5,691
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From: Tolland, CT
Cargo Master
Joined: Mar 2008
Posts: 2,589
Likes: 212
From: Washington
Do you have an AMP meter?
Do you want to keep it or switch to a volt meter?
I believe you can buy a new 3G alternator for about the same as a rebuild 1G.
https://www.ford-trucks.com/forums/1...ator-swap.html
Jim
Do you want to keep it or switch to a volt meter?
I believe you can buy a new 3G alternator for about the same as a rebuild 1G.
https://www.ford-trucks.com/forums/1...ator-swap.html
Jim
Tuned
Joined: Dec 2024
Posts: 448
Likes: 94
From: Texas, near Houston
1980 F250 with the inline 6, and I want to upgrade my alternator from a 35A to a 70A. Is it as easy as swapping the alternators out? Or is there more involved? Do I have to mess with the starter solenoid? I’m going to be running dual batteries and an 85A isolator, too, if that helps. I’ve read somewhere that I need to get a bigger charge cable? I’m not sure. Any help is appreciated. TIA
FTE Legend
Joined: Nov 2015
Posts: 30,983
Likes: 4,136
From: Angier, NC
I would have to ask why the dual batteries and the extra AMP ALT?
The only difference I know of between the 35A and the 70A is the way the wires get hooked up.
One has studs the wires go on and the other a plug on the top.
Because I used the ALT (stud type) from my truck and the harness (plug type) I made jumper wires to make mine work.
Dave ----
The only difference I know of between the 35A and the 70A is the way the wires get hooked up.
One has studs the wires go on and the other a plug on the top.
Because I used the ALT (stud type) from my truck and the harness (plug type) I made jumper wires to make mine work.
Dave ----
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