Lately it seems members are haveing a spat of no Cranking problems with their starters.
I was over snooping at another forum and found this Info that I have never read before concerning how to bypass/test your Neutral Safety Switch.
This Info Concerns a 1984 300D.
Testing for no Cranking; explanation from 240D3.OT mbworld.org.
http://www.mbworld.org/forums/diesel-forum/313982-no-crank-1984-300d.html
“First make sure the selector is in P or N. Cycle through all the gear positions and try in N.
In front of the battery is a small rectangular box. Use a jumper wire to jump from one of the large posts to the small post with the purple wire. If it cranks, you've got an issue with the neutral safety switch or the ignition switch.
Above the accelerator pedal is a 4-wire plug with a harness that runs down to under the accelerator pedal and to the transmission tunnel. Unplug it, jumper across the two purple wires in the female plug and try to start again. If it starts, you need a NSS.”

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84 300D, 82 Volvo 244Gl Diesel