[cdat]

Just joined today, thought I'd make my 1st post/question about something that confuses and frightens the dickens out of me, automotive type wiring/electrical.

I need to wire in a brake controller so I can tow a trailer. I know that Newell provides relays in the front in the passenger compartment, and they connect to the relays in the engine compartment. I do have a 7 wire connecter by the tow hitch, and the brake, turn signals etc are working. I was told Newell has wires that are already in place that run from the front of the coach to the back, true?
That is the extent of my knowledge!
Does it matter what 12v power wire I splice into to power the brake controller?
What do I splice into to enable the brake controller to actuate the connecter in the tow connector? I'm pretty stupid when it comes to electrical, so specifics help if it's possible.
I have a Tekonsha P3 brake controller.
thanks for any help or advice
John