Radio interference, I’m out….

Installed a new radio from Retrosound. Everything works well until....I start the car. With the engine running I have a interference which I cannot figure out.
There's a constant crackling sound in the speakers. Also with the volume on zero. Happens in all three speakers, 1 front dash en 2 in the back.
Now it comes: when I hit the brakes (brakelights on) it becomes worse ??? No other accessoirie affects the noise.
My first thought is a ground issue. I connected the radio on several...

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Author: luigi164