generator

I wonder if anyone knows how to excite the generater on the ford 8n tractor? Please let me know if you do, THANKS VERY MUCH. PS. Also, I was intarested in knowing what the litle lever was for that is located just under the seat on the right hand side just beside the lever that operates the three point hitch?

(quoted from post at 22:52:04 05/02/10) I wonder if anyone knows how to excite the generater on the ford 8n tractor? Please let me know if you do, THANKS VERY MUCH. PS. Also, I was intarested in knowing what the litle lever was for that is located just under the seat on the right hand side just beside the lever that operates the three point hitch?

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a don't really 'excite' the generator. What you do to a generator is set the magnetism in the iron pole pieces, so that there is some residual magnetic field to kick it off to generating. The way this is done is called "polarization" & is accomplished by running battery current thru the field windings. 8Ns have 3 terminal regulators, field, armature, and ground. Applying battery voltage to the Armature terminal for only a second will accomplish the 'polarization'. Battery terminal to ARM terminal on generator OR at regulator ARM to BATT terminals will either accomplish 'polarization'.

Are you SURE you have an "as original" 8N?

If so, first of all it will be (+) ground, 6 Volt.

You polarize the generator by momentarily jumpering between the "BATT" terminal on the voltage regulator and the "GEN" (may be labeled "ARM") terminal on the regulator.

Do this BEFORE initial startup after a long period of non-use or repairs to the charging system. It's an "old mechanic's wive's tale" that polarization is necessary just because the battery was disconnected, then reconnected.

If it happens to have the older style system with a simple cutout, simply jumper between the two terminals on the cutout.

The little lever is to set up the hitch for "position control" or "draft control".

For 'most all operations, set the lever pointing UPWARD, which is "position control"

One of the few exceptions is moldboard plowing, for which the lever gets lowered to it's forward position for "draft control" which varies the operating depth of the plow in response to soil conditions ("draft").

Didn't Ford use B circuit generators? If it is a B circuit you need to disconnect the field wire from the generator or regulator and then apply battery voltage to the field terminal, not the armature terminal.

(quoted from post at 23:53:18 05/02/10) Didn't Ford use B circuit generators? If it is a B circuit you need to disconnect the field wire from the generator or regulator and then apply battery voltage to the field terminal, not the armature terminal.

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The man said, "8N", so what is up with the "B-circuit" and "cut out"? Read his words...why try to confuse him with superfluous "stuff"? I gave him the simple, straight answer to his question. He didn't say he had a Jube, NAA, 9N, 2N, or anything else.
Just an 8N.

YOU REALY SHOULD POST THIS OVER ON THE FORD FORUM I AM NOTTTTTTTTT A FORD MAN, SO NO WARRANTY, THAT BEING SAID HERE GOES:

FIRST OFF, Im unsure if you have a "Class A" Charging System or a "Class B" Charging System ????????????? as many older Ford originally used Class B.

THEREFORE the way you call "Excite" and Im guessing you mean "Polarize" ARE DIFFERENT.

ONLYYYYYYYYY If its an original Class A system you POLARIZE by using a little jumper wire to momentarily flash/jump from the Voltage Regulators OR CUTOUT RELAYS BAT terminal over to it ARM/GEN terminal or else direct from the BAT terminal (on VR or Cutout Relay) direct to the gennys ARM post.

HOWEVERRRRRRRRRRRRRRRRRRRR: If its a Class B like many oder Fords used, you Polarize by flashing the gennys FLD post

DISCLAIMER NOTE: I say the above based on my understanding (may or may not be correct) that on the Class B older Ford systems the Field was internally grounded and you regulate the charge (how much field current) on the input (how muvh voltage is aplied) versus regualting on the output (by direct or resistive grounds) as Class A did.

John T NOT a Ford man buttttttt know many old Fords used Class B

Yo Bob, you happen to know which Fords used Class B charging systems?????????????????? Of course (as Im sure you know) the Class B would polarize differently (see my post)

Whatcha think???

John T

Good catch, I was likewise thinking old Fords used Class B, but Im just not sure ??????????

John T

IIRC, with the Jub/NAA in 1954.

The lever under the seat on the fight side is the draft/position control lever. Up (position control) for everthing except plowing. Down (horizontal, forward) draft control - for plowing.

Thank you for the replies and I apolagize for posting in the wrong area. new to the forum. The tractor is an 8n with 6v system. I have a new reulator and battery but wasn't sure if the generator needed replacing because it's not showing any voltage on the meter. When you turn it over it shows a draw but when it's running it doesn't show a charge.

(quoted from post at 00:09:53 05/03/10)

(quoted from post at 23:53:18 05/02/10) Didn't Ford use B circuit generators? If it is a B circuit you need to disconnect the field wire from the generator or regulator and then apply battery voltage to the field terminal, not the armature terminal.

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The man said, "8N", so what is up with the "B-circuit" and "cut out"? Read his words...why try to confuse him with superfluous "stuff"? I gave him the simple, straight answer to his question. He didn't say he had a Jube, NAA, 9N, 2N, or anything else.
Just an 8N.

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I asked the question because I do not know for sure which system the 8N Ford uses for the generator. If it is a B type generator, then your method of polarizing it will not do the job. B type generators must be polarized by energizing the field terminal rather than the armature terminal. Also if you do not remove the connection between the field terminals on the generator and regulator you can damage the regulator while polarizing the generator.