Offroad lights installation

You want a relay, either an SPDT or SPST. You also need a switch. Depending on what type of switch you use, you may need to pull power from the dash (for dimmable illumination for the the switch). You also need to decide whether you want the switch to only work when the key is in the ignition or not. That will determine how you (from where) you run the power wire to the switch. Use Ohm's law to figure out what size fuse you need (one for sure on the power line to the relay, possibly one on the power line to the switch.)
 
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