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Farmall & IHC Tractors Discussion Forum
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resistor to lower voltage to the head lights

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Paul G. in Mn

04-18-2004 07:17:38




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I am converting my M to 12 volt and wondering is there a way to put in a resistor to lower the voltage going to the headlights to be able to use the orignal bulbs?




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Brad L

04-18-2004 09:31:42




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 Re: resistor to lower voltage to the head lights in reply to Paul G. in Mn, 04-18-2004 07:17:38  
I think after all is considered in the long run it would be chaper to just use 12v bulbs rather then spend a lot of time rewiring and finding high wattage resistors. If you put your lights in series if one burns out you will have no lights.12 volt bulbs are fairly cheap and easier to find than 6 volt anyway. Brad



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Dave_Id

04-18-2004 08:40:20




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 Re: resistor to lower voltage to the head lights in reply to Paul G. in Mn, 04-18-2004 07:17:38  
You can just use a 12 volt bulb, that's all I did, works fine



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txblu

04-18-2004 07:55:49




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 Re: resistor to lower voltage to the head lights in reply to Paul G. in Mn, 04-18-2004 07:17:38  
Yes. Volts/R1 + R2 = Amperage rating of bulb. R1 would be the light and R2 either another bulb or a resistor. But don't forget that Amps x Amps x R2 value (in ohms) = watts. Resistor has to be wattage rated more than working wattage; bulb is already compensated correctly.

But there is a much simpler solution that doesn't wast those "watts". Simply wire your lights in series rather than parallel. In the above equation, if R1 and R2 were your L and R 6 Volt light, you would have 12 V of capability and not need an additionally resistor.

Lights are usually wired in parallel. A feed wire goes to one side of both lights. The other side of both lights grounds to the chassis usually inside the light housing.

All you do is come from the feed to one side of a light (R1), from the other side (of the light R1)you only go to one side of the other light R2 (the wire leaving R1 light doesn't wire to ground at all), and only leave the ground in place on the other side of the second light. Presto you are there.

So your voltage setup is 12v to R1, 6v out of R1 and into R2, and chassis ground on the output side of R2.

Put your light switch in your initial feed line. If you have more than 2 lights, just wire them in pairs as you did R1 & R2.

Good luck

txblu

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steveormary

04-18-2004 10:12:40




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 Re: Re: resistor to lower voltage to the head ligh in reply to txblu, 04-18-2004 07:55:49  
When I converted my M to 12 volt I just replaced the 6v bulbs with 12 v.

steve



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