rca bridging

Hey everyone, I have a friend that just got a new (to him) 2 door truck. He bought a new Kenwood Head unit, a nice pair of components, a 5 channel amplifier, and a sub. We bridged the amp to power the components, but my question is, how are the RCA's suppose to be hooked up? We have been...

My h/u has 5v Front, Rear and Sub outputs and my 4ch is bridgeable (Polk PA660), which i will be running front components bridged off of it with rear speakers off the H/U. So, do i need to run 1 rca from my front-out to my front ch IN on the amp to run bridged, or do I run front and rear rcas...