want to run 4 KCs on my roof rack

I want to run 4 KCs on my roof rack but was wondering if anyone has a wiring diagram on the best way to wire up all 4 lights on one switch. I plan on using relay(s) and fuse(s). Anyone have an idea?

well 4 lights are gunna draw some power, i would recomend useing a serious switch if your gunna run one. i've melted a few switches this way

Run a 18 gauge wire from a hot source on your fuse box under the dash to a switch. From there run it into the engine compartment to the trigger circuit of a heavy duty relay (like 40 amps) or a couple of relays if you can't get a heavy duty one. Then run a heavy gauge (depends on number of relays but big enough for more than the load of the lights that will be connected) wire through a fuse to the relay supply terminal. Then run the wire from the load terminal of the relay to your lights. Make sure both the trigger circuit of the relay(s) and each of the lights is well grounded. Whatever you do, don't just run the wires through a switch. Most switches for automotive purposes cannot handle a constant load of the amperage you will be using.

I may have to run two lights per switch and use two relays and fuses.

sounds like a better idea to me.

Hi! This is the way to wire the relay:

The way I did it was run 2 lights per switch wire to battery then grounded out to a bolt on the roof rail. Then ran the wires in wire wrap stuff through the door jam, underneath the dash panels to where the switch is at in my dash. Have no relays and haven't had any problems in the 6 months or so I've had em on.

I always use relays.

offroadzombies said:

I may have to run two lights per switch and use two relays and fuses.

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you can just use 1 switch and 2 relays