Just about to install this into my ride. I see theres 2 wires. One says Parking brake, and the other says Foot brake.... To have the screen play while my handbrake is down do I ground off both? or just the parking brake?

 

Well your not suppose to be able to do that, but the cheat the system, you could ground the parking brake wire. now these new systems dont even allow that to work, soo you have to wire a toggle switch between the parking brake wire and the ground and flip it 3 times, at least for pioneer. Not sure if its the same for Alpine. Try just grounding it first, then cut the wire and add an inline switch, if not sorry.