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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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