polarize F40 generator

The generator on my F40 needs to be polarized. I have heard that to do so I need to jumper the ARM and BAT terminals on the voltage regulator.

However, I cannot figure out which terminal is which since as far as I can tell they are not labeled.

By looking at the picture of the F40 voltage regulator can any of you describe which is the BAT and ARM terminals?

Take the wires off. Each terminal is stamped B for battery, F for field, A for armature.

I believe you only have to jump from the + battery post to the arm on the generator.

From fergusonenthusiasts.org under tech tips

When and How to Polarize a Generator
Polarization is a procedure which matches the polarity for the generator and the voltage
regulator by permitting a surge of current to flow through the generator, correctly polarizing
it. Damage to electrical components can occur if polarities do not match.
Ferguson tractors have utilized both positive and negative ground systems.
Delco 6V systems have positive ( + ) ground.
Delco 12 V systems have negative ( - ) ground.
Lucas systems for both 6V and 12V models have positive ( + ) ground.
Polarization of the generator should take place whenever any of the following events occur:
1. The battery is replaced or disconnected from the tractor
2. The generator is replaced or serviced
3. The regulator is replaced or serviced
If any of these events occurred, do not start the engine until polarization is done. The
polarity of the generator must be set to match that of the voltage regulator.
Make a jumper wire (14 or 16 gauge) long enough to reach from the battery to the
generator. Put alligator clips on both ends.
To polarize a generator on a tractor having a Delco 6V positive ground system or a Lucas
6V or 12V positive ground system, attach one clip to the A terminal on the generator. With
the other clip, briefly for only a split-second (or a spark occurs) tap the negative ( - )
terminal on the battery.
To polarize a generator on a tractor having a Delco 12V negative ground system, attach
one clip to the A terminal on the generator. With the other clip, briefly for only a split-second
(or a spark occurs) tap the positive ( + ) terminal on the battery.
Turn on the ignition switch. On models with the charge indicator light (TE/TEA/TO-20), the
light should come on (indicating discharge) before the engine is started. Once the engine
starts and the system is charging, the red light should go off, just like the idiot light on many
cars and trucks.
If the engine is running slowly so the generator is not charging enough to overcome the load
(ignition/lights) the red light should come back on or glow slightly. Also, because the cut out
relay in the regulator will not close (and connect the generator to the battery to charge it)
until the generator starts putting out enough power to charge the battery, the light may stay
on or the ammeter will show discharge until the throttle is opened enough to raise the
engine rpm enough to get the generator provide enough current to charge the battery.
If the ammeter needle moves in a negative (discharge) direction when the engine is revved
up, you must reverse the two wires on the back of the ammeter.
6/30

The generator has 2 terminals. One is stamped 'F"

As far as I can tell the other terminal is not stamped. Is this the "A" terminal?

Yes, the other generator terminal besides the "F" terminal will be the "A" terminal.

Since this is a Delco, it is an "A" circuit generator.

To polarize the GENERATOR, simply momentarily jumper between the ungrounded battery terminal and the "A" terminal on the generator.

You do NOT have to disconnect anything.

I used a wire to jumper from the A terminal on the generator to the positive battery post and nothing happened.

I'd like to try to jumper on the voltage regulator. With a multimeter I figured out that the middle terminal is the BAT. However, I cannot figure out the other 2 terminals.

Does anyone know which is the ARM and FIELD terminals on the voltage regulator?

Also, in attempt to see if the voltage regulator terminals are labeled, I tried to take off the screws but they are so rusted I cannot remove them without stripping.

In addition to jumpering the ungrounded battery terminal to the "A" terminal on the generator I also jumpered the A terminal to the Bat terminal on the voltage regulator. Neither method produced a spark.

What is the next step to take to diagnose the problem with the F40's charging system?