Remove A-pillar molding, sunvisors, then header panel, then lower cover panel in front of door opening.

Should get you enough room to fish the wires through.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles