To replace the upper wiring loom is relatively easy. I did it in less than an hour. Clip the old one out loosen a few nuts, thread the new wiring loom though where the old one was, connect and walla done.

I need to get a lower loom now and try the same again. I must say I have had MB before, but this beast is definately a Friday car (shoddy work). Everything that could go wrong has. The tranny lost reverse ($3000), evaportator leak ($2500), rear window motor ($850), Blower motor ($360) did it myself, Upper wiring harness ($850) did it myself, lower sound insulation rubbing on drive shaft (juryrigged back up), and now the lower harness is going gone out (still trying to decide if it is worth it to fix now)