ONE WIRE ALTERNATOR

[JERSEY JOE]

Anyone running a one wire alternator on an AMC V8?

what model fits with the least issue?

[Crankyolman]

I'm using a 1 wire Powermaster 150 amp that is a Motorola replacement. It wasn't cheap but it's a real nice alternator, was easy to install and seems to work very nicely.

[JERSEY JOE]

So it's just the positive big wire with nothing else?

do you have a part number?

[Cecil14]

The big positive output wire is not the "one wire." Regardless of what alternator you get, you will always need a field wire. You can technically take a regular SI or CS alternator and move the sense wire back to the big positive output post. You lose the remote sense ability, but if you're not concerned about that it won't be a big deal.


There are plenty of one-wire SI alternators out there. I don't have any particular recommendations handy, but they are out there.


Is there a specific reason you want to run a one-wire?

[Ristow]

yah,not a one wire fan. three wire is so easy to hook up,and so better.

[JERSEY JOE]

With this special regulator there is only one wire, the battery + wire

https://www.ebay.com/itm/1-Wire-Self...72.m2749.l2649

[Crankyolman]

Originally Posted by JERSEY JOE

So it's just the positive big wire with nothing else?

do you have a part number?

Because my truck is a '72 it had a 30 amp Motorola alternator so I needed one that had the 1" mount, later ones had wider mounts. You can find the powermaster replacement alternators on page 108 & 109 in their catalogue.
http://www.powermastermotorsports.com/catalog.html


This is how it hooks up
http://www.powermastermotorsports.com/alt1_gm_si.pdf

Originally Posted by Cecil14

The big positive output wire is not the "one wire." Regardless of what alternator you get, you will always need a field wire.

I don't know how they hook it up internally but the Powermaster I have only has one big main wire and a ground to hook up, no additional field wire. They do have the ability to connect to the amp light on the dash with a connector that looks like the one for a 3 wire but they say this about it,

Originally Posted by Powermaster

Optional Charge Indicator Light Function: Your Powermaster Alternator is designed to work as a 1 wire without any connections to the plug in.The function of the plug is to run a charge indicator (Idiot Light) only. This plug also does not serve as a hookup point for a voltmeter, or help charging at idle. This connection has no effect on charging performance

[Cecil14]

Originally Posted by Crankyolman

I don't know how they hook it up internally but the Powermaster I have only has one big main wire and a ground to hook up, no additional field wire. They do have the ability to connect to the amp light on the dash with a connector that looks like the one for a 3 wire but they say this about it,

They must be piggybacking off the output wire internally, which would have power from the battery before the alternator starts charging. Without some initial power, an alternator will not charge. Doesn't really matter where the initial power comes from, but it does have to be there.

Again I have to ask, though, is there a reason you want a one-wire alternator Joe? As Ristow said, three wire (really only need two) alts are super easy to wire, and offer a pretty significant benefit in the remote voltage sensing if you take advantage of it.

[JERSEY JOE]

No I am taking your expert advice and will go with the CS-130 100 amp. I did get the replacement harness with the one wire plug that has the diode in in that goes to acc 12v. So there will be the large battery + lead and the plug with the diode /
that goes to acc 12 v. I guess I can wire this to the coil 12v.

So it's a 2 wire. Would be 3 if I wanted an indicator light. I will run a digital volt meter inside so that I can monitor the running voltage which should be 13.8 to 14.2????

Also my CS-130 case has been machined down to the width of the AMC mount.

Thanks ALL!!

[rocklaurence]

I ran a Power Master 1 wire until the bearings went out. Since then Ive run the Advance Auto single wire in two trucks without any issues. However, the Advance Auto units are only 40 amps but I have good AGM batteries and have never had issues with running the battery down even when winching.

[KillyMcGee]

I run this one:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

But I run it in a 3 wire configuration. To run it as a 1 wire you simply unplug the 2 other wires. Fit was fine (swapped my pulley onto it)

[tgreese]

Originally Posted by JERSEY JOE

No I am taking your expert advice and will go with the CS-130 100 amp...

Which Jeep? Don't run the factory ammeter with that alternator - could cause a fire.

Supposedly a 3-wire can be configured as a 1-wire if you connect the sense wire to the charge wire and leave the excite wire floating. Not a good setup though, since it has to spin fast for the residual magnetism in the rotor to make enough voltage (how many barrier potentials?) to excite the circuit.

[nograin]

The ammeter, the fusible link, or really even the connections for those has little to do with the alternators output.
Decisions should be based on the load a wire will see. In plain english, how much current the lights or equipment will draw through those circuits.


Nothing should be on the battery run except the battery (and the starter) with a few exceptions - such as an electric winch. In that case, its worth looking into a direct connection with the alternator or some form of isolation and a second battery. That all depends on the winch or plow load, but the alternator's potential output then should be looked at.