Hi. I drive a bmw e46 touring 2000 modell. I installed a new soundsystem in my car. And i have a problem. All the speakers going trought the amplifyer i have in the car get tgis statick noise from them. But the sound only come on when the lights on the car is on. And if i press down the brake pedal. The sound disapears. I have tried different grounding points but still the same. Does anyone have some ideas of what i can do?