I would caution running direct battery power that far. If there was ever a short prior to the fuse, you could have a fire in the passenger compartment. I would install a weather proof fuse holder on the engine bay side of the firewall to be safe. If you really want to be slick with your install, you could get a fuse holder work box kind of thing and bolt it to the car in the brake booster/fuse box area. (Rather than have an inline fuse holder hanging out). I personally wouldnt mind the weather proof holder hanging out if the wiring was all wrapped and secured nicely.

Best of luck. Nice project.


Question, will you be sitting any higher with the electric seats? I dont care about the power one way or the other, but the seats in my W126 are much more comfortable than those in my W123.

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85 300D 3 pedal. Current project.
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.