Help with buzzing sound from speakers

I just finished installing a new amp and speakers in my 2013 DC Tacoma and now when I turn the whole system off from the deck I hear a slight buzzing noise from the speakers. I've crawled around the internet, and tried grounding the amp to the frame but that hasn't helped. I even used a jump cable to run the ground right back to the battery and that didn't help either. The sound disappears when I remove the speaker level input connector so I suspect the noise is coming from the stock deck, any helps or tips to solve this?

BTW this is how my system is wired:
1. Ran new speaker wire from the deck to under my seat for each speaker.
2. Speaker level input is wired to each of the new leads.
3. Ran new speaker wire from the amp to each speaker.

FYI the wires do not cross the positive to the amp at any point or run along them. The amp is a Alpine MRP-F300.

Any help would be appreciated. The system sounds great with the sound on, but it's annoying that I have to turn the gain all the way to min to minimize this High Pitch Static like noise.

 

Does your amp stay on after you turn off the deck? If so, chances are the deck leaves the speaker outputs "floating", and since your amp stays on, the amp is amplifying any electrical noise induced on the deck's speaker output wires. If you can't find an accessory output signal from your deck, you could always just run the amp's remote signal through a switch mounted near the driver. Turn off the deck, then turn off the amp.

 

try wrapping exposed wire around the RCA output of the radio and ground the other end to the radio. Some radios have weak ground points on for the RCA preouts. which cause extreme ground loops or white nose.