Resistors convert power to heat, that's how they work.
When on ''dim'' the resistor on the light switch converts some of the electrical energy to HEAT rather than sending it to the lamp filaments.
What are you doing that requires using the ''dim'' setting?
Unless driving on the road at night, keep the lights on ''bright'' and the resistor will be out of the circuit and NOT heating up.
Heck, by the lighting standards of modern vehicles even on ''bright'' your old tractor headlights would be BY FAR the dimmest lights on the road, even on bright.
So, once again I ask ''what are you doing that requires ''dim''/barely glowing headlamps''?
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
... [Read Article]
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