My SD when bought new,the owner had 3 amps put in.The Techs could not fix.Years later I did.What was happening is everytime you screw the amp on,it pushes the metal sockets and wires down.Mercedes should have allowed more flex in the harness.Solution is to wedge up the wires and metal sockets,so as you screw down the pins,the sockets don't move.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt