Hey Lund - you can get a 12V relay at any automotive parts store (Pep Boys, AutoZone, Checker, etc.). They're usualy just a few dollars each.
The wiring diagrams come with the relays, but I found one on www.offroaders.com and have uploaded the picture. You can see their high-resolution picture at: http://www.offroaders.com/info/tech-corner/reading/relay-diagram.gif.
I would recommend that you run one relay per 2 lights. You CAN run one switch, into multiple relays too, but I wouldn't do more than 4 lights / 2 relays per switch (as a general rule of thumb).
Overall, relays are VERY easy to do, it just takes a bit of time (approx 15 minutes per relay) to mount and wire them in.
Rick |