I'm installing an amp and sub in my trunk tonight or tomorrow and was hoping you guys might have some insight into the best place to route the Line-in, power and remote turn-on wiring from the front to back?

Hooking stuff up in a w123 is slightly complicated by the position of the fuel tank righ behind the rear seat. I would start by removing the rear seat and the front and rear carpets. Should be easy for you to see the "conduits" through where the other stuff is routed.

Vacuum lines pass through on the right side and electrical stuff passes through on the left side. Should be pretty easy to fit in more wires into either of those passages.

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"

and dont screw into the fuel tank!!!

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daw_two
Germantown, TN

Links:
Sold last car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more