just bougght ANOTHER late 300. amongst other things the rear wiper doesn't. and the washer motor spins but nought from the jet but this should sort easily.. any body know which is the relay of the 3 I think I've found. I've got a good early wiper motor wityh the different wiring, can I make this work?
 
If you take the wiper motor out and give the inside a good clean up you might find that it works again. :)
 

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