My E320 has an electrical problem (I think). Engine won't turn over, no dash lights come on, windows will not go up or down, seat and headrests work, radio has juice, headlights and parking lamps work but turn signals don't. Any ideas? Help!

 

does the key turn to the start position

 

Jump start the battery first or have the battery checked with load tester. your local parts house can do that.