check fuse. if good then maybe take the motor out and put it to the battery an and see if it works.

if it doesn't u need a new motor, and your in good luck! i have one for sale in the parts forum

if it does see if the wires are getting power when u hit the switch using a multimeter.

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198? 300D ???K - Future DD
1989 300TE 285K - traded in '12
1984 300SD 186K - Sold in 08
1978 300SD 330K - Died in 05