Scott,

Great right up. Thanks for the extra bit of info on the N7. I have lamp warning lights on from time to time and I have no lights out. I have dim headlights and have cleaned the grounds and chased wires. While my lights are still dim, I drive on High beam at night, clearly i have not resolved this issue. As a last resort, I did think of doing just what you have described.
Now that I am trying to install some Euro lamps I think I may perform this relay mod.

I would still like to get wiring diagrams for the lighting system on an '87 300TD.

Thanks in advance to anyone that can help.

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83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.