Found this over on Rockcrawler:

http://www.rockcrawler.com/techreports/rocklights/

I'm using it to help me along with my light installation (I'm an electrical newb).
Hopefully it helps someone else out aswell, as it's a fabulous writeup.

 

Corey has a great write-up on off-road lighting in the tech section.

 

awesome tech article. thanks for the link

 

I like the article ... it's drawings were fundamental and easy to follow. My only constructive criticism I offer is appyling soldered connections. Soldered connection work better under when wet and are more resistant to vibration.