I am getting HORRIBLE feedback noise from my system. When I turn key to acc radio comes on then a high pitch squeal then speakers pop. Only thing I can think is the ground. So I check bunch of threads but no one SHOWS where they grounded.
I grounded to one of the brace bolts behind the sear, and I sanded down to bear metal. Can anyone add some input?

 

I am grounded to a brace on the driver side trunk. There is actually already a ground spot, but made a new hole, removed paint, and use lock nuts and washers.

 

I grounded mine to the fuel pump ground on the trunk floor near the back. No issues here. Where did you get your signal from?

 

I get signal from RCA cables. I have pioneer DVD unit and bypassed factory amp