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Discussion Forum
Show Parts for Model:

Ford 8N voltage regulator

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Ivan

08-27-2000 18:36:02
216.174.2.151



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Can someone describe the operation of the points and the voltage regulator itself. Are both points supposed to be open when the tractor is off? I am trying to locate the problem with the tractor cutting off and draining the battery totally. The generator has been checked and is o.k. and the battery is also good. Any suggestions?




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Ivan

08-28-2000 05:50:38
216.174.2.39



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 Re: Ford 8N voltage regulator in reply to Ivan, 08-27-2000 18:36:02  
Claus,

Thamk you for your great explanation. I am still not sure if both points (I only have 2) are supposed to remain open when the tractor is cut off. As it is now, 1 is open and 1 is closed? How do I adjust the closed one to an open position (if it is supposed to be open)? What is the meaning of shunt?



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Claus

08-28-2000 06:35:24
209.214.70.146



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 Re: Re: Ford 8N voltage regulator in reply to Ivan, 08-28-2000 05:50:38  
The meaning of shunt is that both coils (fine wire go from a voltage source to ground, whereas the two heavy coils do not go to ground and are in series (One connected to the other) Now then the cutout relay should be open when the tractor is not running. This coil is a single pole single throw configuration. The other one is a single pole double throw configuration. When the tractor is not running the arm will be to the upper contact. This is the normally closed contact. When the battery voltage of this coil reaches (or current) the designed voltage this contact will vibrate.
Happy Motoring
Claus

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ivan

08-28-2000 18:27:34
216.174.2.47



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 Re: Re: Re: Ford 8N voltage regulator in reply to Claus, 08-28-2000 06:35:24  
Claus,

What a wealth of knowledge you have. Thank you so very much. I took off the voltage regulator. It appears to have carbon on the thick wires, so I am going to get another regulator. Also the points were looking bad. I was told that I needed to polarize it again when I install the new one. How do I go about doing this? Again, thank you very much and I will be looking forward to your reply.

Ivan

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Claus

08-29-2000 03:52:30
209.214.70.123



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 Re: Re: Re: Re: Ford 8N voltage regulator in reply to ivan, 08-28-2000 18:27:34  
You polarize by taking a jumper wire and connecting one end to the bat terminal of the vr. and touch the other end to the gen terminal of the vr. Under no circumstances touch the other end to the field terminal of the vr. This could damage it. When you remove the jumper you will notice a spark. This is normal.
Happy Motoring
Claus



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Claus

08-28-2000 05:09:12
209.214.73.62



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 Re: Ford 8N voltage regulator in reply to Ivan, 08-27-2000 18:36:02  
There are 2 types of voltage regulators for the N. Electrically they are the same. Mechanically they differ in the number of bobbins they have. The newer type has 2 bobbins and the older type has 3.
In both types there are 4 coils of wire. 2 are shunt types and they are for voltage sensing and are the coils that have the thin wire. The other two coils are in series and are the thick wire coils. The voltage regulator performs 4 functions. Voltage sensing of the generator, voltage sensing of the battery, charge current sensing and reverse current sensing. On the 2 bobbin type, each bobbin has a voltage sensing and current sensing coil. One bobbin is the cutout relay or sometimes referred to as the circuit breaker. This function is identical to the 2N/9N cutout relay. It senses when the generator voltage is high enough to charge the battery and closes the contacts. Now there is a path from the generator to the battery. When you turn the engine off, the heavy coil on this bobbin will open the contacts with reverse current flow. This prevents the battery from discharging through this relay. The other bobbin looks at the battery voltage and at a preset level usually somewhere between 7 and 7.5 volts open and places a resistor in the ground path of the generator field coil. This produces less output of the generator by reducing the magnetic field of the field winding. The heavy coil on this bobbin, monitors charge current of the battery and will also pull in and put the resistor in the field circuit when a peset charge current level is met. On the three bobbin type of regulator the cutout relay is identical. The other 2 bobbins only have one coil each on them. The middle one with the heavy wire is the charge current sensing unit and the end one is the shunt battery voltage sensing unit. You can see from this that the 2 bobbin unit if you play with the gap to increase the charging voltage you will also change the charging circuit sensing.. Hope this explains it..
Happy Motoring
Claus

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Ivan

08-28-2000 05:08:16
216.174.2.39



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 Re: Ford 8N voltage regulator in reply to Ivan, 08-27-2000 18:36:02  
Pat, I don't know what you mean by reverse current. I work on cars, but this is the first tractor I have ever worked on, so there's a lot to learn. What about the points being open or closed during the time when the tractor is not running?



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Pat R

08-27-2000 19:32:09
63.254.228.155



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 Re: Ford 8N voltage regulator in reply to Ivan, 08-27-2000 18:36:02  
Does your tractor still have a reverse current cutout on it? If it does and i would guess that would be your culprit



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Pat R

08-27-2000 19:31:33
63.254.228.155



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 Re: Ford 8N voltage regulator in reply to Ivan, 08-27-2000 18:36:02  
Does your tractor still have a reverse current cutout on it? If it does and i would guess that would be your culprit



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