1 wire alternator update

I need more help. I am trying to help my son. I posted early about installing a 1 wire alt on a Ford 1841 diesel. well I looked at the alt today and it is a Auto Zone Duralast # 7172M it is a Delco remy. It has 1 large terminal marked Batt and a red cover under which are 2 terminals 1 is F and the other is R. Maybe it is not a true 1 wire, Is there any way you can jumper either of those terminal to excite the alt? this is the same model alt that was on the tractor when he first got it. Maybe it is not reving up enough rpms to excite it. Probably in over my head any help is appreciated.

That is why I never use the 1 wires. Some need 2000 plus RPM to excite and if you look at the paper work that came with it you may find that is the problem.

Brillman and Steiner both have a one wire self exciting @800 rpm.

It would be nice to see a picture of back of your alt, as I stated the other day, automotive 1 wire alt. will take more rpm to excite it, I have put many 1 wire alt, on all types of equipment, Just put one a 4600 ford diesel,and it charged good , had to run motor over about 1200 to excite it but stayed charging after excited even at an idle, please make sure it is a true one wire alt, some parts people get them mixed up, I have had that happen, did you buy the alt ?

Thats good to know, like I say the automotive type have the wrong diode in them to excite at low rpm

Yes From Auto Zone

I checked that 7172M number on the Autozone online site and they could not match it to a part or info about it.

Look carefully near the regulator plug, in addition to the R & F marking, should be a #1 and #2 unless it is an old external regular 10 DN.

Is the regulator plug on the rear face of the alternator with the terminals arranged like this {II} and pointing to the rear ? If so it is an external regulator 10DN.

If the regulator plug is on the rear outer edge,not the rear face with the terminals arranged like this {--}, and pointing to the side, then it is an SI type with internal regulator.
The red plug over that opening would indicate to me that it is a 1 wire unit, as many cover that hole to protect the regulator terminals

If it is a 1 wire alternator and has lost its rotor magnetism, you can flash it to get it going by momentarily jumping it with a wire from the rear Bat terminal to the #1 regulator terminal under that red cap, with the engine running 1/2 throttle. The same thing would happen by having a working generator light attached to the #1 alternator terminal.

Does the tractor use an ammeter or a generator light, ?? I need to know to help you.

I made a typo it is a 7127 It has a amp meter. I ran a wire from the F terminal(2) to the batt stud on alt and it charges 14.2 volts but stays there and does not drop down. what you are saying is I should flash the R (1) and see if it charges and remove the other wire I put on. the amp meter is not wired right I odnt think the alt goes through it I don't know how to wire it
Thank you

The voltage will remain at 14.2 volts as long as the tractor is running. That is the voltage setting of the regulator. The amperage however will taper off as the battery is recharged.

As posted above by Owen Aaland , the alternator is working fine and holding a normal voltage in the 14 range, no need to flash the #1 lead.

In an earlier post I tell how to wire your alternator through the ammeter, That is the wire from the alternators BAT terminal to the ammeter post with more than 1 wire on it, that should get you a working ammeter to show charge.