noise is driving me crazyy!!

Hey guys i know i may sound like a straight noob i apologize before hand but this is really driving me crazy!!

I have gone step by step one for one and have isolated that the radio is the cause of the issue or the alternator, i have tried running new rca's from the head unit, ive tried pulling the eq out of the equation but still the same noise. I have tried different radios: older alpine 9887 or something like that, a walmart pioneer deck, and just today an alpine cde-123 and still the same thing!!

I have two ground points from the alt to the strut tower and 2/0 from the batteries to the factory rear ground post. Tomorrow when i get home from work im going to run 2 ground leads ( just got more wire in)

i have tried running a power/ ground 16 gauge wire from the rear amp distro block to the radio / eq and same deal. I also tried a new harness and even tried grounding by the firewall

Im trying to avoid using a ground loop isolator but it seems like the only hope i have in a quite system

P.S I also tried grounding the pioneer deck at the rcas and same thing help!! plz