alternator wiring question

[wirelessace]

I have a question, I ordered the Ron F. roadster wiring harness, I am using an alternator from a 1989 ford mustang. I have saved the plastic connectors with some wires attached to splice into the ron F harness. Now that i am ready to do it I cant find clear instructions as to what I connect the 2 wires from the Ron F kit to out of the 3 wires that go to the farctory plugs. I looked in the chilton manual i have and it does not really show what the wires are and do.200202200203200202200203

[edwardb]

The 1989 Mustang had a 2G alternator. This link to the other forum has a diagram for the 2G. Also a discussion about the hazards of using the 2G. You might want to reconsider. Especially with dated wiring and connectors since that was the source of some major issues. https://www.ffcars.com/threads/2g-alternator-wire-diagram-needed.546121/. Do some Googling and you'll find more info including a TSB from Ford.

Ford released the 3G a little later which is apparently a significant improvement. In either case, the Ron Francis harness only has the large charging cable which goes to the big terminal on the alternator. Breeze sells a harness for connecting a 3G. https://breezeautomotive.com/shop/harness-regulator-3g-alternator/.

[rich grsc]

I fully agree. You can get a new 3g for around a $100.

[wirelessace]

Thanks for the info, quick follow up. I respect the community here and will make my own choices based on everything I digest in responses. I am planning to twin turbo my build. I took the donor approach and removed the 1989 mustang motor trans and rear end. The motor has been completely gone through and built for boost. I got the ron Francis body harness and I am going to use a Holley terminator for engine management. Can I just get a one wire alternator or should I really get a 3rd gen mustang unit?

[mejhaha]

I just did this conversion-2g to 3g.

I got my parts as well as the 3g alternator from Amazon - alternator was $78.

Personally, my selling factors for 3g vs 1 wire was the known constant charging at low rpms and the ability to find an alternator at pretty much any parts store anywhere.

The wiring was very easy/straightforward.

[edwardb]

Thanks for the info, quick follow up. I respect the community here and will make my own choices based on everything I digest in responses. I am planning to twin turbo my build. I took the donor approach and removed the 1989 mustang motor trans and rear end. The motor has been completely gone through and built for boost. I got the ron Francis body harness and I am going to use a Holley terminator for engine management. Can I just get a one wire alternator or should I really get a 3rd gen mustang unit?

Lots of opinions on this one. I can only cite my experience. I've used 1-wire alternators on all but my Coyote builds. Easy to hook up and they worked fine. I used alternators from Tuff Stuff Performance. They say they excite and charge at low RPM's. Something not every 1-wire, especially older ones, do. Probably other brands are the same. But having said that, a new 3G would be about the same price and is arguably a better technical solution.

[JJ in Cbus]

I started to post and checked out the first link Edwardb posted above https://www.ffcars.com/threads/2g-alternator-wire-diagram-needed.546121/, and saw my post from back then. I used a 3g Alternator from a 92-94 Aerostar. It gives you a little more power (95Amp) and peace of mind. It is easy to splice into the Ron Francis harness. Eight years later and have had no issues with it.

jj

[rich grsc]

jj, that is exactly what I use, and recommend. It can be found many places for less than $100 bucks.