Intermittant R. wiper
 

The rear wiper on my C250TD auto estate has a fault which causes it to wipe 110 degrees, pause, and then wipe the remaining 70 degrees plus the return 180 degrees. I imagine that if there were contacts tracks built into a rotating gear then a break in such a track would give rise to this manifestation ( I'll be MB did not know they fitted such a thing!!) Before I go and tear it appart, to either repair or ruin it, I would appreciate any info. from anyone who has has a similar malfunction. Any wiring diagrams, schematics, illustrations etc. would be gratefully received. Thanks. :confused: