Date registered: Apr 2005
Vehicle: 92 W140 300SD 97 VW Jetta TDI 89 VW Fox diesel
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After checking to make sure fuses aren't toast I would put a test light on the starter solenoid wire and with a second set of hands (helper) check for continuity with the ign switch turned to the start position. If you have power to the solenoid in "start" then it's either starter or solenoid.
Would be surprised to see solenoid or starter go without any advance warning.
97 VW Jetta TDI
90 Passat wagon TDI conversion
92 W140 300SD