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.
I would suspect it's not the BMW wiring, but how the guy who installed
the CD player has connected into it...
Start by pulling out the CD player, and checking how it's connected
into the BMW loom.
Connector blocks a good, twisted wires lacking insulating tape are
If all looks good there, check the connectors onto the bottom of the
rear speakers, sometimes they can get a bit loose with age, and a
quick squeeze with a pair of pliers works wonders.
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