Installing a camera on my trailer...help please!

First off, ALWAYS check with a multi-meter before connecting. You never know about wire colors. Always verify.

I ran a dedicated line from my +12v bus bar to the back of the trailer that goes through a relay triggered by the running lights. I used one of those cheapo clip on wire splice things on a front running light wire that was easy to get to. Only for the relay trigger though, no power draw.