Hi all
Its a UK 91 E34
Standard 4 speakers around the car, some previous owner added a cd player unit in the dash.
Now when i go over bumps, sound drops to maybe 1 left speaker, or 2, so thats none at the back, another bump might put sound to all 4....this happens all the time, so i guess it would be a dodgy bit of wiring.
Where would i start to look? I have no idea how BMW wired up the car.
many thanks