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Jubilee generator question

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Wayne Mo

09-26-2002 20:59:28

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My jubilee generator is different from my 8N, it has one side of the field grounded and the other gets voltage from the regulator to excite it I guess. My question is how does the regulator send voltage to the field when the tractor is started? I know Ford used externally grounded generators where Delco was always internally grounded. The generator brushes are not connected to the field at all, it must receive voltage from the regulator. What triggers this, just the small voltage from the residual magnetism in the generator at start up?

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Dell (WA)

09-27-2002 01:49:44

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Re: Jubilee generator question in reply to Wayne Mo, 09-26-2002 20:59:28

Wayne..... ...your generator field power (volts) actually comes from a vibrating contact inside your voltage regulator. It vibrates depending upon the state of charge of your battery. Discharged, slow vibration, full charge, fast vibration. This controls the strength of the magnetic field of the generator that the armature turns through. The stronger the magnetic field, the greater the armature AMPS output to charge your battery.

The reason Ford used external ground, is internal ground resistance caused by RUST between mechanical parts fastened together. Delco used internal ground because they didn't think the rust resistance was that much of a factor. Until GM Started producing the fiberglass Corvette....woops no body grounds.

Your brushes are actually mechanical switches that change or keeps the armature output DIRECT CURRENT instead of the alternating current that the rotating armature thru a magnetic field naturally produces. This is requirement of your BATTERY. Batterys are a direct current device..... .....Dell

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Wayne Mo

09-27-2002 08:23:04

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Re: Re: Jubilee generator question in reply to Dell (WA), 09-27-2002 01:49:44

I plan next to polarize the gen by removing the field terminal from the reg and touching it to bat voltage. Then if no gen output, I will remove the field term from reg and put 6v on it to see if that brings it around. If it does, I will play around with the regulator spring forces but will likely have to buy a new regulator. I think the gen is ok, I measured 3.2 ohms onthe field coil and the commutator and brushes looked ok. I told youbefore the bat had discharged thru the reg before and likely damaged it. I wonder if it discharged thru the field or the arm of the gen. If it had done so thru the arm I would have expected burnt wiring harness which did not. I will know more tomorrow!

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NO NO NO!!! . . . Dell (WA)

09-27-2002 09:50:11

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Re: Re: Re: Jubilee generator question in reply to Wayne Mo, 09-27-2002 08:23:04

Wayne..... ....DO NOT USE FIELD TERMINAL for polarization..... .EVER, understand?

Polarize at the Voltage Regulator by briefly sparking the BATT and ARM terminals with the engine not running. UNDERSTAND?????..... ..Dell

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Wayne Mo

09-27-2002 20:33:50

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Re: Re: Re: Re: Jubilee generator question in reply to NO NO NO!!! . . . Dell (WA), 09-27-2002 09:50:11

I don't see how it would hurt to disconnect the field terminal from the regulator and touch that to the bat terminal if the field is internally grounded in the gen as it is in my NAA. On that subject, were all the 8N's externally grounded and the Jubilees internally grounded like mine are? I can see where that would present a problem servicing them in the field. In fact how could you tell if it was internal or external ground without actually disassembling the generator?

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Dell (WA)

09-27-2002 21:32:59

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Re: Re: Re: Re: Re: Jubilee generator question in reply to Wayne Mo, 09-27-2002 20:33:50

Wayne..... ...when you "polarize" your electrical system, you not only magnitize your generator field shoes (poles) but ALSO "polarize" the core of the cutout relay bobbin inside the voltage regulator so they all work together. Do it like I told you. Momentairly flash your voltage regulator BATT and ARM terminals together. UNDERSTAND????

Don't get confused, the 8N's external ground wire scheme is in ADDITION to the common grounding electron flow thru all the metal engine/body stuff. It will work just fine (like your NAA) without a ground wire on 8N's that don't have the little rubber baby buggy bumper ground isolating and vibration assorbing OEM voltage regulator rubber standoffs. (you can't buy'em anymore anyways) There is a slight technical advantage to the 8N's external ground scheme, ok?..... ..Dell

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Wayne Mo

09-29-2002 10:14:48

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Re: Re: Re: Re: Re: Re: Jubilee generator question in reply to Dell (WA), 09-27-2002 21:32:59

Thanks Dell for the technical info. I never heard about the cutout coil being polarized as well as the gen magnets! I think I understand the system now. It still bothers me that the Naa and the 8N had such different (external vs Internal grounding) systems and they are not distinguishable by looking at them. Is there an easy way to tell an external from an internal ground system without taking the gen apart?

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Wayne Mo

09-27-2002 08:16:15

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Re: Re: Jubilee generator question in reply to Dell (WA), 09-27-2002 01:49:44

Thanks for the info, I think I understand. I still do not see what initially prompts the voltage signal to the gen field. Does it start with the ignition switch turning on? Or does it just build slowly from residual magnetism in the generator magnets? There is no connection I know of between the ingition switch and the field terminal of the regulator, especially when the cutout relay is out of contact. I knew the vibrating contacts altered the voltage signal before but it is a hard concept to understand. I would think such a system would not be reliable for any life at all and the points would not last very long under any circumstances. It is hard to visualize contacts merrily vibrating away for years of operation! But I will take your word for it along with all the other experts!

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Dell (WA)

09-27-2002 10:04:39

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Re: Re: Re: Jubilee generator question in reply to Wayne Mo, 09-27-2002 08:16:15

Wayne..... .....the generator starts charging due to an INTERNAL connection to the cut-out relay (which disconnects the battery FROM the generator armature when engine stops) AND some residual generator pole magnitizm from the field coils. The strength of this magnetic field is governed by the voltage regulator vibrating field contact. The stronger the magnetic field, the more the generator output to charge the battery..... ..Dell

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