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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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