This may help you out
http://www.thenewx.org/forum/showthread.php?t=621 .
I recently installed 2 pair of KC Hilites, plus a small Wal-Mart pair on a rack atop
my Xterra. Using the directions from the above.
If I were to do it again, I would do it differently. The inline fuse holder from the battery
is for 32 volts as is the fuse holder inside the vehicle. If the lights that you purchased have relays and instructions state the relays must be close to the battery, that maybe why he choose to do it this way. So, you may need some extra parts.
The lights today are not like they were back in the day. All that was needed then was 2 wires a switch, a fuse and a light. They are much more complicated now, at least the ones I got.
Unless someone more qualified then I steps up, let me know when you can stop by and I will do my best to make myself available. I live by Sam's Town.
Best regards, Charlie