I have a 240d just got and it start only when jumping across soneloid, key switch doesnt wrk. I s there a fuseable link or relay bad,, I think it is some kind of wiring problem , but not sure where to start...Got any ideas?? Thanks

I would look at the ignition switch, NSS, grounds and connections for starters. Also bench test the relay for the starter.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

sounds like its time to break out the multimeter and start testing. The NSS is definitely a likely culprit - and when you're down there, check the shift linkage bushings to make sure they're not at fault either. The ignition switch is kind of a PITA to get at so I would leave that until last. Its all a matter of testing continuity and working your way up river.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

I'll agree with the Neutral Start Switch suggestion.

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83 SD

84 CD

It would be nice if you updated your sig to include the cars data. Manual tran have no NSS. But I too agree this is the most common culprit. Unless some idiot forgot to tighten the solenoid wire screw all the way. *whistles*

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

It is an auto trans and neutral switch should be down underneath at linkage for the trans correct.. Also where is a good place to get a wrk shop manual..thanks

http://www.peachparts.com/shopforum/showthread.php?p=646647

Here you go - this is from the DIY section (under "resources" on the top navigation). Found it as I was looking up my own issues

__________________
TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

If 240Ds were all made before 1985 you can get the Factory Service Manual CD set directly from Mercedes. $19.99+$7 shipping.
http://www.classictechlit.mbusa.com/MB/category.asp?Page=1&catalog_name=Retail&category_name=1009

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84 300D, 82 Volvo 244Gl Diesel