hey i was just trying to wire in my new sony HU and was having no problems. i got it wired in no problem but there was a hissing noise through my rear speakers. i looked and saw that there were some audio wires loose at the back of the block on the HU side. i reconnected these but when i plugged the power block back in nothing happened. i tried my other two HU's and got the same result so i know its not the HU. any idea why i have no power anymore? i've checked the blocks, could it be a fuse?