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Allis B

Glowing where it's not supposed to

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Scott M

08-21-2000 20:07:01

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Well, you guys helped me through the governor thing and for that, thanks. Now on to the new thing. When the light switch is in the off position and the tractor is running at medium to higher RPMs, the resistor on the bottom of the switch is glowing. Assuming the this tractor didn't come with a cigarette lighter option installed, what would make it do this? BTW, it is getting hot enough that it is beginning to melt the insulation on some of the wiring inside the box. At low beam position or high beam position, no glow. Why is it getting so hot? Is this normal? Also, even though the bulbs are good, they will not light up with the switch. Are the problems related? If so, how?

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Ted Seifert

08-22-2000 09:51:23

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 Re: Allis B - Glowing where it's not supposed to in reply to Scott M, 08-21-2000 20:07:01  
The resistor is in series with the field winding of the generator ONLY in low charge. In all other switch positions the resistor is shorted out and the generator is in high charge. Look for a short to ground (chassis) for the wire going to the "F" terminal of the generator. Look for misswiring or a shorted field in the generator.

Good luck.

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Scott Murphy

08-24-2000 11:23:38

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 Re: Re: Allis B - Glowing where it's not supposed to in reply to Ted Seifert, 08-22-2000 09:51:23  

That explains why it only gets hot when the switch is in the closed position. It still doesn't seem like it should get that hot (in the closed position) unless there is a problem somewhere else. Would a short on the "F" terminal wire or in the generator cause the extra load across the resistor or should I look elsewhere?

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Karl in MD

08-21-2000 21:42:56

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 Re: Allis B - Glowing where it's not supposed to in reply to Scott M, 08-21-2000 20:07:01  
I don't think it should get hot enough to glow, but charging resistors do get hot. The reason it doesn't get hot with the lights on is that it's not needed. The lights use enough juice that the generator's full output is used (probably about 8 amps). Without the lights, and with the resistor in the circuit, it limits the generator's output to @2-3amps. The excess amperage is dissipated as heat. If it's getting hot enough to melt insulation, the resistor is bad, possibly shorted, and could, over time, damage the generator (especially if it burns out and allows an open circuit, which will fry the generator windings). Sorry so windy, hope this helps; Karl

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