Hi Bob -- I read right over the vintage of your car when I made my reply! Apologies... yes, I'm sure your setup is MUCH different than on my W201! Good luck getting everything to work. Could you use a mutlimeter to find the "hot" wire for the running lights and just use a wire tap to then run a wire to the side markers? A tap would put a small cut in the factory wiring insulation but would not require that the wiring actually be cut & spliced.

You've probably already thought of this and I'm probably missing something obvious... just throwing ideas around! Hope you can find an easy solution!

Chris

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)