wires
 

i hope this is posted in the right area but i have a 1990 Mercedes-Benz 560 sel and i want to put a different stereo deck in it but none of the wires are labeled and there are a few different plugs. does anyone know where or how i can get a wiring diagram? i know what a few wires could/should be but i don't want to just start cutting and testing wires.