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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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