Mercedes-S420- 60k miles-Sat for a longtime- Electrical Issues

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Mercedes S420 Passenger Window inches up when closing, rear passengers window inches up, passenger side interior lights, rear tail lights stay on, short in headlamp switch, no radio, no electronic back seat headrest adjustment, sun roof sporadically opens. One owner, original 65k mile sat in garage since 98. When Starting- engine turns over, very loud clunk.