There's a parking brake connection that allows video only when brake is actvated.To bypass this do you connect that wire to positive or ground it?

 

Ithink its to the positive but with a inline fuse... i could be wrong. like if you did it through the parking brake, it will only let you play dvds if the parking brake is set and making a full loop... but i could be wrong.

I had a in dash dvd for my car but never put it in and sold it with my car but i asked around and they said to put it to a contoled switch. so yeah....

 

Iam pretty sure you should hook it up to a negative. At least that is how my radio/dvd player is.