nothing stopping you running all 4 lights of a 40 amp relay, it should take the power (i have 4 x55watt lights on a 30 amp relay), 4 bulbs at 100 watts, 12 volts is 8 amps/light, so the relay will take it, you will need a bigger fuse tho. Biggest problem is voltage drop, get the relay as close to the lights as you can, and use the biggest wire you can find to power the relay, might want to put 2 relays in each running 2 lights, that way if anything fails you still have 2 operating lights, that"s the way i"d d it, then use a 20 amp fuse for each relay. I"ve had problems in the past with relay burning up from too much heat, so make sure you buy a good quality relay, Hella or Bosch seem to be the best.
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Today's Featured Article - The Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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