04 Prius - Installing Backup Camera - Need Power Source for Monitor

Hi guys! Need your help. I'm in the process of installing a backup camera on my 04 Prius. I opted to buy a separate 4.3" monitor instead of doing the NAVtool route which was obviously the more expensive but cleaner solution. I got everything hooked up. Camera has power and signal is good when I switch to reverse. The video cable is routed to the front now.

The only thing I really need now is a power source for my monitor. I dropped the wire to the harness plugs right next to the foot brake. But I don't know which plug has the 12v feed. I posted a picture of the plugs I am looking at and hopefully someone can help me figure out which wires to tap into for positive and negative.

I could run the wires to the cigarette lighter but that will be my last resort. There's a bunch of wires on these plugs and for sure there will be a good source here. Just don't know which harness plug to tap into.

Any help is greatly appreciated. Thanks!

which for power source? | Flickr - Photo Sharing!

 

So I decided to remove the driver seat and figure out how to tap on the navigation harness. I am reading that the gray wire in the main plug is switched 12v. Is that correct? Also what is the negative wire color in that harness? black?

 

Thanks Mutual! I ended up just tapping from the cigarette lighter in the dash. Works perfectly now. I added a rocker switch in case I am not backing up and the screen turns blue. That way I can turn it off via the switch.