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Farmall & IHC Tractors Discussion Forum
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'52 Super C Dimmer Resistor

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Mike Lumley

12-13-2007 08:07:44




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Does anyone know the resistance (ohm) reading that the dimmer resistor on the light switch should be? I have inquired @ the local IH dealership. The part #814545 is no longer available seperately, but it does come with a new light switch. Can I put on an aftermarket resistor?




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karl f

12-13-2007 15:45:23




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 Re: '52 Super C Dimmer Resistor in reply to Mike Lumley, 12-13-2007 08:07:44  
the Dim position isn't really necessary other than originality. (maybe legality on the road) stock lighting is pretty dim, even on 12v machines of the 70s when on bright/full power with clean connections. the dim and bright difference should have been adding bulbs in my opinion. not to mention relays... ;)
karl f



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karl f

12-13-2007 15:45:20




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 Re: '52 Super C Dimmer Resistor in reply to Mike Lumley, 12-13-2007 08:07:44  
the Dim position isn't really necessary other than originality. (maybe legality on the road) stock lighting is pretty dim, even on 12v machines of the 70s when on bright/full power with clean connections. the dim and bright difference should have been adding bulbs in my opinion. not to mention relays... ;)
karl f



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Janicholson

12-13-2007 08:51:23




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 Re: '52 Super C Dimmer Resistor in reply to Mike Lumley, 12-13-2007 08:07:44  
A 3 ohm resistor that can handle 80 watts (power resistor should work fine. The wire resistors found in heater blower motor controls will also work. They need to be crimped into the circuit (both get hot when in use. They can be found at electronics stores, or the internet. The headlights use about 35 watts each, and will overheat and burn Too small of a power resistor. Some power resistors can be purchased with an adjustable band contact allowing the resistance to be adjusted from zero to 5 ohms. That would allow you to set the dimness of the lights. Be careful to insulate the resistor from case contact to prevent shorts. The insulation should be heat resistant. 100 watt resistors are pretty big. I hope this helps, JimN

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John T

12-13-2007 09:24:24




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 Re: '52 Super C Dimmer Resistor in reply to Janicholson, 12-13-2007 08:51:23  
Jim, I figured you or Bob could help on this but I have a couple things n wonder if they need attention????? ?

You sure the dimming resistor is 3 ohms?? Thats the approx value of a generator field current control resistor but Id guess the light dimming resisitor to be less say 0.5 to 1 ohm??? I HAVE NO IDEA THATS JUST A GUESS, I guess it wouldnt be hard to calculate the correct resistance if we knew the load of the lights and wanted to reduce the current by say 25% to 50%

If he uses an after market switch and NOT an original that has the DIM lights position, its gonna have to have the necessary external wiring terminals and appropriate internal switch contacts to allow the addition of the series resistor in DIM but by pass it when in BRIGHT

Im just thinking any old radio Shack On/Off light switch will NOT have the terminal and inner switch contacts to accomplish what hes trying to do maybe????

Just curious, I may be making more out of this then necessary but just not sure what exact switch he has in mind n these red flags popped up in my old engineering brain lol

Take care

John T

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Janicholson

12-13-2007 14:50:39




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 Re: '52 Super C Dimmer Resistor in reply to John T, 12-13-2007 09:24:24  
I Think any resistor of a value between .5Ohms and 3 ohms will dim the lights The adjustable resistor with sweep contact is probably the best. No one uses the lights on dim because they are dim when on the bright setting. Good luck, JimN



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Mike Lumley

12-13-2007 09:32:04




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 Re: '52 Super C Dimmer Resistor in reply to John T, 12-13-2007 09:24:24  
I am connecting to the original light switch 363130R91. The old resistor was just worn out/ broke.



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John T

12-13-2007 14:01:14




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 Re: '52 Super C Dimmer Resistor in reply to Mike Lumley, 12-13-2007 09:32:04  
Not a problem then (far as switch n terminals) as you just wire the new resitor in place of the old. Now if Jim can confirm the exact ohms (Id just be guessing) its off to the electronics store you go n dont forger its gotta be a power resistor..... ..... or a series or paralell combination of the correct ohms n capable of dissipating the heat.....

JT



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Mike Lumley

12-13-2007 08:57:33




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 Re: '52 Super C Dimmer Resistor in reply to Janicholson, 12-13-2007 08:51:23  
thanks for your help



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