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More red hot resistor

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alannpa

11-22-2005 13:33:51

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The tractor still has the cutout,6 volt, Pos ground. The wire is connected to the F terminal of the genny. I have the connection at the resistor at the terminal away from the switch. The series seems to be F terminal, through the field resistor, then switch. I cannot find a good diagram of the switch showing the wiring. If anyone knows where there is one I'd appreciate it. I've used a copy of the Parts and Service manual. but it's unclear.

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Bob M

11-22-2005 14:09:42

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Re: More red hot resistor in reply to alannpa, 11-22-2005 13:33:51

Still sounds like your wiring's messed up. But messed up away from the light switch. From your description the wiring is correct here.

Punch below for a wiring diagram that may help you sort things out.

Farmall cutout wiring diagram

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Janicholson

11-22-2005 16:51:19

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Re: More red hot resistor in reply to Bob M, 11-22-2005 14:09:42

If the field was internally shorted, (much lower in resistance than designed) wouldn't it "shine" the resistor?
JimN

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Bob M

11-22-2005 18:50:55

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Re: More red hot resistor in reply to Janicholson, 11-22-2005 16:51:19

Jim - I suppose could in theory. But only if the generator could develop current with a shorted field winding.

However, without a working field a generator does not create any output. So there would be no current available to pass thru the shorted field and thus overheat the resistor.

I'm still thinking the problem's a wiring error...

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John T

11-22-2005 19:38:45

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Re: More red hot resistor in reply to Bob M, 11-22-2005 18:50:55

I enjoy this sparky chat so had to jump in. Probably is a wiring error, if part of the Field windings in the genny were shorted, I dont see any current flow through the light switch resistor because its (if wired right) grounded at the switch end PLUS grounded at the gennys short circuit and theres no voltage potential source to cause current flow in a path thats the same (ground) potential on BOTH ends. The normal source voltage is from the gennys Armature post which creates current flow to and through the field windings and then the light switch resistor to ground, so if the field were shorted, I agree with Bobs thinking the genny aint gonna put out a great amount (can some on the poles residual magnetism) and there would be even less field and light switch resistor current then if all was okay. I.E., I think if there were a shorted field, the light switch resistor would see less NOT more current Make sense????? ??/

I think thats what I think lol its late n Im cornfuzeddddd . I can envision theres a hot voltage source getting to that low ohm field current resistor and 6 or 12 volts across such a low impedance could indeed make her glow red till she burns up. I think the typical field currents like in the 1 and 2 amps range but if you put 6 or 12 volts across the light switch resistor I think thats more current then it can handle, as its designed to be in series with the field windings NOT have battery voltage across it only. I gottaaaaa go with its wired wrong or a hot wire is shorted to it.

Thats my story n Im stickin to it fer now lol

What yall think??

John T

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Janicholson

11-23-2005 06:19:43

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Re: More red hot resistor in reply to John T, 11-22-2005 19:38:45

I believe that a short circuit means that there are parts of the intended circuit no longer in it because of a fault. The fault does not need to be to ground (a dead short). If a coil of wire (wrapped around an iron core) is 151' long, and it lost some insulation and "internally" shorted to itself (as my earlier post stated), and lost 30 % of its effective length, the current would go way up providing a strong field magnetism.
Great discussion!
JimN

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John T

11-23-2005 11:23:01

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Re: More red hot resistor in reply to Janicholson, 11-23-2005 06:19:43

Hey Jim, I cant argue with that, for sure, if theres a "winding to winding" as opposed to a "winding to case" short (thats what I was talking about in my post) the current would increase. However, Im not sure the "field magnetism" would increase, as its a COIL of wire wrapped around a soft iron core that produces the magnetism and if the internal short were located such that the current just by passed most of the coil windings, then there could be more current but less magnetism, meaning less genny output voltage and if the output were real low the cutout relay wouldnt ever pull in whereby battery power could feed into the short and eventually through the light switch resistor.

I still bet theres a hot voltage source shorted to the Field terminal on his switch causing a lot of current to flow through that resistor to ground...

Thanks Jim, Yeppers a great n fun discussion, were probably boring the others lol

Take care n Happy Thanksgiving

John T

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Janicholson

11-23-2005 12:20:37

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Re: More red hot resistor in reply to John T, 11-23-2005 11:23:01

You be correct! There is a crossover point at which the current will increase and the magnetism will decrease. I wonder where the ground in the system is sense the resistor should have only one end hot, and the other hooking to generator - (the "hot" side) JimN

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