I want to add a rear view camera to my 04GT and was wondering how to wire it up.. I see people grabbing power from the brake lights or reverse lamps.. Is there a difference? Are there any other ways to hook it up? TIA!

 

Use reverse lights so it will come on when you backup. Using the brake lights would cause it to come on every time you touched the brake pedal.

 

I have my truck's camera wired to the tail lights.
I have an off switch for the camera at the screen.
Wiring it this way allows me to run the camera any time my parking/headlights are on.
I like to be able to have the camera on even when I am not in reverse (I have a manual tranny).
Really handy backing down long slopes very slowly. (And trailering with the truck)

 

Yes, if I wanted it on more often, I would look into running a key on hot wire for it and switch that if needed. Some have used the positive wire in the 7 pin plug but they are mostly hot with the key off.