I made a new wiring harness on my 504 recently and installed a new light switch. I went back with sealed beams and used 14 ga wire, so I know there should not be much voltage drop.
If you have small wire or are using the $10 Blazer brand Utility lights from Wal-Mart, I would wire them through an automotive relay. They are about $3-$4 dollars at most parts houses. The lights I mentioned are BRIGHT floods and look like your typical universal tractor light. They have a H-3, 55W bulb, which is 110W total, for 9.2A (2x55/12=9.2A). I do not like running that much thru a toggle switch.
Relays are pretty simple and make locating the switch easier and keeping the light wires shorter and closer to the battery. I am going to add two of these lights onto my loader to increase my night visiblilty.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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