Moparts

1 wire alternator

Posted By: Rallye_Boy

1 wire alternator - 05/08/09 02:03 PM

Does anyone here use a 1 wire alternator?
Posted By: rabid scott

Re: 1 wire alternator - 05/08/09 09:36 PM

The one wire alternator is expensive and usually not in stock at your random parts house. Unless you have to have a one wire, I'd use a GM 10si or 12si.

I prefer the GM 10si or 12si when I need to use a GM alternator. They are affordable and available in stock everywhere in case you ever need to do a roadside repair, easy to hook up, and come in a variety of amperages.

On an off-note, I have an early Chrysler alternator on the '62 Chevy 283 in my Model A. Not many people do that, I bet!
Posted By: Rallye_Boy

Re: 1 wire alternator - 05/11/09 02:14 PM

I guess I never really thought of using a GM alt on my Mopar engine.

What is the 10si and 12si. Is that a part number? A model? Not familiar with GM stuff
Posted By: rabid scott

Re: 1 wire alternator - 05/11/09 05:27 PM

One wire alternators are GM alternators. In fact, I think the single wire alternator is based off the 10si or 12si alternator.

Everything you ever wanted to know about 10si/12si alternators is right here:

http://www.madelectrical.com/electricaltech/delcoremy.shtml

Part numbers, applications, everything is in this link.

If you need any help, let me know. I've wired these up a few times. I've got a 90 amp one in my '57 Chevy truck, and I've even thought about wiring up a 90 amp one in my Challenger just to get rid of the "Chrysler alternator flicker".

Heck, if Sam Posey's race T/A Challenger had a 12si, it's got to be good, right?

Attached picture 5222186-alt.JPG
Posted By: Rallye_Boy

Re: 1 wire alternator - 05/11/09 05:36 PM

Thanks for the info. I am starting to wire my model A. So I need all of the info I can get.
Posted By: Rallye_Boy

Re: 1 wire alternator - 05/11/09 05:40 PM

I suppose I will have to customize a mounting bracket too. Huh
Posted By: Anonymous

Re: 1 wire alternator - 05/11/09 06:38 PM

I'm against "one wire" lashups for street use, and you'll find that there are no vehicles (that I know of) that routinely use a so called "one wire" alternator.

The 10/12 SI siries work just fine. If you don't want to run a separate sense wire, they ae easy to hook up. There's "no1" and "no2" on the regulator plug. Just jumper no2 to the battery stud on the alternator, then hook no1 to a keyed ignitions source through a diode.
Posted By: rabid scott

Re: 1 wire alternator - 05/11/09 09:39 PM

Quote:

I suppose I will have to customize a mounting bracket too.



What engine are we working with?

Quote:

hook no1 to a keyed ignitions source through a diode.



The diode is important, otherwise you will have a "run on" condition after you turn the key off.
Posted By: 4speeds4me

Re: 1 wire alternator - 05/12/09 03:00 AM

Quote:

...and I've even thought about wiring up a 90 amp one in my Challenger just to get rid of the "Chrysler alternator flicker".



I believe AndyF has a fix for that that's pretty simple and WELL worth it, while still allowing the thing to look TOTALLY stock!
Posted By: Mopar Ron

Re: 1 wire alternator - 05/12/09 03:21 AM

Quote:

hook no1 to a keyed ignitions source through a diode.



The diode is important, otherwise you will have a "run on" condition after you turn the key off.




I found the way around that problem....
you just have to hook the #1 wire to the ACC side of the ing switch instead of the run side Ron...
Posted By: Anonymous

Re: 1 wire alternator - 05/12/09 06:00 AM

Quote:

Quote:

hook no1 to a keyed ignitions source through a diode.



The diode is important, otherwise you will have a "run on" condition after you turn the key off.




I found the way around that problem....
you just have to hook the #1 wire to the ACC side of the ing switch instead of the run side Ron...



You don't want to do that. I'll guarantee you --unless these units have been changed electrically by GM--that if you do that long enough you'll blow up a diode trio. I don't remember all the "ins and outs" but there are situations where the diode trio can "try" to become the source (charge, or supply source) and they won't handle much amperage. The original cars had a resistor / lamp combo, so you either need that or the diode.
Posted By: Mopar Ron

Re: 1 wire alternator - 05/12/09 06:24 AM

Quote:

Quote:

Quote:

hook no1 to a keyed ignitions source through a diode.



The diode is important, otherwise you will have a "run on" condition after you turn the key off.




I found the way around that problem....
you just have to hook the #1 wire to the ACC side of the ing switch instead of the run side Ron...





You don't want to do that. I'll guarantee you --unless these units have been changed electrically by GM--that if you do that long enough you'll blow up a diode trio. I don't remember all the "ins and outs" but there are situations where the diode trio can "try" to become the source (charge, or supply source) and they won't handle much amperage. The original cars had a resistor / lamp combo, so you either need that or the diode.



I don't know what you mean by "long enough" but last year I had a charging problem and the run on issue and with my 40 dodge PU with the gm alt and I was tring different things with the # 1 wire and the #2 wire and after talking with a bunch of streetrod guys we figured out that the reason it was running when the key was turned off was because it was being feed from the #1 wire to the Ing run side and I needed to either put a lite in line like GM does or just get the power to the #1 wire from the ACC side. so that is what I did and for 8 month now it works just fine Ron..
Posted By: Rallye_Boy

Re: 1 wire alternator - 05/12/09 01:29 PM

what engine are we working with?

360
Posted By: rabid scott

Re: 1 wire alternator - 05/12/09 03:46 PM

Quote:

what engine are we working with?

360



Make life simple on yourself, get an alternator from a '69 and earlier Mopar. You can use the factory brackets, they only require two wires, a big fat one to the battery positive and one to an external voltage regulator, which hooks up to a 12v power source.

Super, super easy. Like I said above, I adapted one to the '62 283 Chevy engine in my Model A. Early Chrysler alternators look way cooler than any GM piece.

I'll post a picture when I get home.
Posted By: Anonymous

Re: 1 wire alternator - 05/12/09 06:39 PM

Quote:

Quote:

Quote:

Quote:

hook no1 to a keyed ignitions source through a diode.



The diode is important, otherwise you will have a "run on" condition after you turn the key off.




I found the way around that problem....
you just have to hook the #1 wire to the ACC side of the ing switch instead of the run side Ron...





You don't want to do that. I'll guarantee you --unless these units have been changed electrically by GM--that if you do that long enough you'll blow up a diode trio. I don't remember all the "ins and outs" but there are situations where the diode trio can "try" to become the source (charge, or supply source) and they won't handle much amperage. The original cars had a resistor / lamp combo, so you either need that or the diode.



I don't know what you mean by "long enough" but last year I had a charging problem and the run on issue and with my 40 dodge PU with the gm alt and I was tring different things with the # 1 wire and the #2 wire and after talking with a bunch of streetrod guys we figured out that the reason it was running when the key was turned off was because it was being feed from the #1 wire to the Ing run side and I needed to either put a lite in line like GM does or just get the power to the #1 wire from the ACC side. so that is what I did and for 8 month now it works just fine Ron..



I think you misunderstood. It WILL work "just fine" for ahwile, but you need the diode/ or resistor/ light in there to protect the diode trio in the regulator. By "long enough" I mean "some period of time." Might be a week. Might be a year. I don't remember the mechanics of this failure, but there are/ is a certain condition which can cause the trio to become a source of power and the small trio diodes won't handle the load. This is a well documented failure, and is why the no1 is hooked up this way
Posted By: moparx

Re: 1 wire alternator - 05/13/09 12:44 AM





Make life simple on yourself, get an alternator from a '69 and earlier Mopar. You can use the factory brackets, they only require two wires, a big fat one to the battery positive and one to an external voltage regulator, which hooks up to a 12v power source.

Super, super easy. Like I said above, I adapted one to the '62 283 Chevy engine in my Model A. Early Chrysler alternators look way cooler than any GM piece.

I'll post a picture when I get home.


and there is an electronic voltage regulator available to replace the original points type. it also is a direct install to replace the original.
Posted By: Rallye_Boy

Re: 1 wire alternator - 05/14/09 04:17 PM

I think I am going this route
Posted By: poorboy

Re: 1 wire alternator - 05/15/09 02:10 AM

It always seemed like a bunch of work to swap over to the famed 1 wire alt just to loose 1 or 2 wires at the back of the alt, I just don't get it. Maybe if the 1 wire was a much better set up, but that doesn't seem to be the case from what I've read. Guess I'll continue to use 3 wires at the back of the alt on everything I build. Gene
Posted By: Rallye_Boy

Re: 1 wire alternator - 05/15/09 01:07 PM

I agree
Posted By: 85_Ram_4speed

Re: 1 wire alternator - 05/19/09 11:18 AM

I used a 1 wire 10si before in my old race car, in my opinion,, its just not worth it for dependability/easy to fix if rosadside issues. I never had a problem with mine, but the thought was always in my head. They way to go is the stock system or a regular 10si GM alt in my opinion. I also agree with an above post, the chrysler alternators look sooo much better cleaned and painted up.
Posted By: Rallye_Boy

Re: 1 wire alternator - 05/20/09 05:37 PM

I went with the regular mopar alt
© 2024 Moparts Forums