12v power from JBL amp behind rear seat

Does anyone know which of the wire / terminals on the JBL amp are the 12v power? I installed a dashcam on my windshield using a fusetap on my accessory fusebox behind the dashboard, and now I want to install another one on the back window. I found the dashcam at costco, and there are ones on Amazon for as little as 50$, seems cheap insurance for a crash and a cool way to document wheeling adventures like stream crossings etc. Ideally I would rather not run wire back to the rear of the cab if I can just tap into the 12v at the JBL amplifier and use an inline fuse to the dash (rearviewwindow) cam

 

http://crutchfield.custhelp.com/app/answers/detail/a_id/7590

The answer might be in the diagrams linked to above, anyone an electrical wizard and can point out which one I want to tap? Is the diagram of the inside of the plug or the outside?

I'm pretty sure it's numbers 1 or 11, I have to test to see if the acc(11) is on only when the key is in the ignition I'm pretty sure #1 is constant and will not work as I want the camera to come on with the truck.

 

P.S. Add inline fuse to camera...