I made a relay box with lid for my Jeep off-road rig that cleaned alot of extra stuff up... I use all negative triggered relays... No power in and outta the cab area to short out..... I use a cat-5 computer cable to go from my switches to that box..and one in the box to for that matter... I can just plug it into the side of my box.....
Here is the finished pic of of the inside of it....
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link to the rest of my build pics of it some are blurry... didn't have the greatest camera back then....
http://s45.photobucket.com/user/magimerlin/slideshow/electrical
this is how I do ALL of my relays..... negative triggers........
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link to the thread on another forum I'm on that can describe it a bit better and has a few more boxes members have made... And describes the whole process...
http://www.naxja.org/forum/showthread.php?t=938344&highlight=relay+box&page=10