Got an issue I need help with. I have 4- 150watt KC style lights that are getting mounted. With the lights came two wiring harnesses with 50 amp relays. We wanted to power up all 4 with one switch. Question is, can you run the switch lead from both relays to the same switch to get all 4 to come on, or are we going to have to put another 50 amp relay in there to power up the other two relays off one switch? I know this sounds retarded and I should know the answer. We are just trying to do this install right without burning a truck to the ground!

 

One switch is all you need. Use both relays!

 

sure just hook up the one switch u'll be fine the relays only draw milliamps (very little power)

 

150W X 4 lamps = 600W. 600W/12V = 50A. That relay can handle all 4 lamps, barely. The advice to run two relays with one switch is sounds, it will make the relays last much longer.