Cheers I just replaced my starter. 87 300 SDL,, When it would not start,, had to tap the solenoid and starter with a iron bar and then it would start.. but this is a sign of bad brushes and or starter solenoid sticking . ended up putting rebuilt one in ,,,in your case I would check if the wires are tight to the posts on starter,, and then try ,,, if that does not work gently tap it and try starting,,, but if taping works,, I'd look at getting a rebuild. also verify battery post connections are clean and tight too ,,hope this helps,,good luck Cheer DD