I ordered a light bar for the front of my truck where i will mount 2 hella 500 lights. I just ordered some 130 watt h3 bulbs to go in lights and it comes with 50 amp relay. What gauge wire will i need to buy to run these lights? also what size rocker switch? And if theres anything else i should buy let me know please.

 

amps is watts/volts. 260 watts/12 volts is about 21 amps. 12 gauge house wire is good for 20 amps. I'd go 10 gauge just to be safe. Any type of rocker switch will work as long as you have it wired to trip the relay.

 

and you need to crack open the lights and completely re-wire them as well, the 18 gauge they are wired with will not do... If your longest run (not including to the switch) is no longer than about 6 feet, then 12 would do, anything over that and I'd go 10...