Did you check the fuse..? Have you swapped your fuses for copper bits?
More often then not the plastic gear fails.. But it's an older electric motor @ this point so anything is possible!

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta