Bronco ii 2.8 1 wire alternator conversion

[mjr46]

Guys I'm looking at doing a 1 wire alt conversion for my bronco ii as it intermitantly won't charge and i now run an odessey battery and the old alt and external regulator is just not enough for my needs, I use my B2 to plow and the front is outfitted with 4 off road lights for plowing so I need a good 100 amp alt.....was looking at the tuff stuff 1 wire alt form summit racing part number 7068?? does any one know if this will work or have done the conversion before?? If so what did you use?

 

[mr_manny]

Have you heard about the ford 3g alternator upgrade?
This was one of my first mods on my B2

Lots of info here on TRS, here's one example:

https://www.therangerstation.com/forums/threads/how-to-130-amp-alternator-in-a-2-9.138592/

 

[85_Ranger4x4]

While popular for tractor 12v conversions because "one wire" sounds easy they are less than ideal because they are RPM based and you have to spin them decent to get them to do anything. RPM's are not an issue for a road driven car, chugging around at 1000rpm is a lot different.

You are kind of doing tractor things and with that many lights that I assume are not LED I would have qualms.

GM had a similar alternator that takes like three wires, basically instead of self exciting it excites when you turn the key on. They perform much better at low RPM for minimal additional complexity. That is what I retrofitted to my 1950 tractor, many tractors in the 70's used them from the factory.

I don't know about amperage options but like a '86 2.9 alternator has an internal regulator and the same electrical hookups (charge, key and ground) and does the same thing. I used one of those on my 2.8 so I can vouch they fit well.