Ready to polarize generator

Okay, I have everything wired up exactly like the FO-4 electrical diagram for a late model 8n.

My voltage regulator has an I, S, F, and A. I know the f is for field and the a is for armatrure.

What is the I and S stand for?

Currently, I thought the I to the ignition side of the termnal block and S is wired up as the ground.

Agin, I dont know if I have the correct voltage regulator and will probaly end up having to get a new one ($30).

I have reveiewed the archives for polarizing the generator and many believe it is not necessary and there are others who have it as a simple 2 second jumper on the battery to voltage regulator armature.

Any bits of advice before I hook the battrey up and see what I got?

The "A" term is Jumpered to the "S" term and connected to Generator Armature.

The "I" term is connected to Battery (ammeter), not to the ignition as originally intended.

The "F" Term is Generator Field

This will not work if your Gen is Type A.

To test: With out any wires connected to the Generator (Bench or on tractor) Hook Battery (hot)to the Gen Armature & Bat Ground to GEN Frame(use ordinary Jumper Cables). Fan Belt Loose Then full field Test Using a Jumper Wire with one end connected the GEN field Terminal

If it Motors (rotates)when the other end of the Jumper wire is connected to Frame (ground) the
Generator is a Type A.

If it Motors (rotates)when the other end of the Jumper wire is connected to Armature (BAT). The
Generator is a type B.

BTW: The Generator will be polarized during testing so use the correct battery polarity.

The field connection of the generator goes to the F on the regulator. The armature connection of the generator goes to the A on the regulator. The ground on the generator goes to the ground slot and the B on the voltage regulator should go to the ammeter loop. Correct?

Hope this Helps,

The ground ont he reg will be obvious.. just flip her over.. that only leaves you with the charge line out as you have the field and armature identified.

Hopefully you have the correct reg.. where did you get it?

( jumper arm to bat ) to polarize a A-circuit system.

Soundguy

I see there are three connections at the bottom of the regulator. However, the ground must come off the generator and connect to the top of the voltage reulator (I beleieve on the mounting slot where it will bolt to the tractor). Is that right?

Also, I need the two position resistor inbetween the key switch and the coil to protect the coil and allow the igniton switch to cut power. The igniiton will tap into the power loop created by the voltage regulator whihc cirlce the ammeter and the solenoid... correct?

When I look at wiirng diagrams on here and in the FO-4 manual, I see these as this is how wires should be hooked up (to point A and then to B) but yet it is not eactly this cut and dry ... is it?

I do not like or understand electricity at all.

The resistor is there to limit current to protec tthe coil. with it missing.. the ignition won't even be powered. there is no 'loop to tap.'. etc..

Yes.. vr will have that side ground tab.. and then f, a, b,

Soundguy

Soundguy

By your description, it sounds like you have a regulator for a later Ford, with a "B"-type charging system. The correct system for your tractor is an "A" system, and, unless someone has put a "B" system generator on there, the "B" regulator ain't gonna get along with the "A" circuit generator

On a late 8N, the regulator will have an "F" terminal, and "ARM" terminal, and a "BATT" terminal. A ground wire runs from one of the regulator mounting bolts to the generator case.

DON'T power it up, or polarize it, or start the engine 'til you are SURE of what you have.

Any part numbers on the regulator? Do you still have the box it came in?

I stopped and got one today. ($30!)

I also am confused by the FO-4 wirign diagrams.

I see these diagrams as how each wire should come off of what item and where it is suppose to connect to but some how there is more to it than that.

Soundguy