Not sure about a 99 E Class. On the 99 C Class it was on the right side of
the trunk (passenger side), pull the panels off it's tucked away with other
wires in the wiring harness. The fibre opitic wire is orange in color and
the power cable is red (I think). I just installed on my CD changer on my C
Class this morning. Painless, easy installation.
BTW, I spoked to a technician in one my local dealerships he mentioned that
pre-wiring for 99 Model MB's will be a hit or a miss, the fibre optic
connections was introduced in the second half of that year. So according to
him depending on the when your MB came out of the factory you may or may not
find the cables.
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