I got a set of Pro Comp 130 watt off road lights from 4 WheelParts. It was supposed to come with a switch kit. But it did not. When I put these on, what size fuse should I use?

 

well it should be ran from the battery through a relay with a 20 amp in line fuse or circut breaker . the switch should be attached to the relay from another power source with a 5 amp fuse . go low . if they blow you can go higher . but they shopuld be wired in a way that the lights arent ran through the switch itself . they will burn it up ...if you find the 20 amp isnt enough go to 25 . you what to keep it the least amperage you can without blowing the fuse . use 8 or 10 guage wire for the lights power and 14 to 16 guage for the switches power .

 

It looks like I have a project for the weekend. Thanks again.

 

I agree with Macgyver on most of his suggestions, run heavy guage wire, use a relay, place the fuses close to the battery etc. but there is no need to guess at component ratings.

Current is equal to the Power (wattage) divided by the voltage, or 130w divided by 12v.

Since the voltage will be higher when the engine is running (~13.7 vdc), use 13 volts to make the numbers easier.
So 130w/13v equals 10 amps PER light.
A 20 amp relay is really not sufficient. Go with a 30 amp relay and a 25 amp fuse. and you will be just right.

P.S. The fuse for controlling the relay need only be a 1 amp.

Good Luck... XLT_D.