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A block heater (which the '87 came with from the factory) would help the engine start while the underlying problem is diagnosed and fixed. At most a power cord will be needed for the block heater. A trickle charger on the battery will ensure a full charge for starting in the morning and will also keep the battery warmer that it otherwise would be, sitting out in the cold overnight.
The 603 engine starts much more easily when it's allowed to glow at least ten or fifteen seconds. Don't go by the Preglow light, it shuts off too quickly in most cases. If it's cold, the full 30 seconds is a good idea.
The NSS problem could be caused by worn shifter bushings, a worn, damaged, or loose NSS, or damaged wiring. Sometimes it's possible to wiggle the shifter or move it between neutral and park in order to get the starter motor to engage.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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