LongDistanceTech

Does anyone know where (or if it even has one) the rear speaker harness connector is? My last Transit work van (2013 XLT)had rear speaker wires @ the head unit, but when I got it, the shelving units were already installed, so I had no access. I simply parallel connected some wires there to the existing factory wiring. It (and new one) are leased, so minimal damage/alteration is key. I want to add the power amp I was using to the new one, by using rear channels to feed it like before. 100W/ch into Polk Audio Atruim 4 outdoor speakers sounded pretty good! If rear harness connector exists, where is it?