Not getting charging voltage in back.

[Cashdollar2009]

I recently went over my system and built a new box for my car while relocating my amplifiers to the rear. The ONLY thing I did related to the power wire was remove both fuses from my two runs of 2/0 up front to the rear, and then removed the fuses on both runs on the fuse blocks by the rear bank. BEFORE I re-did everything, I was getting my 15.XX Volt charging reading. Now, with the car running I am getting 14.6V IN and OUT of the FRONT fuse blocks, but only the same 12.4V IN and OUT of the REAR blocks. It is nothing but continuous 2/0 to this point??? How can I be missing this? Any help is appreciated.