I drove about ten miles this morning and noticed that all of the instruments, except the clock, stopped working. The car runs fine and everything else seems to work. I checked the fuses. All okay so I rotated each one. Still no instruments. I also noticed that the big relay was buzzing when I turned on the ignition like a relay was closing all the way. I pulled it out and put it back. Still nothing. I don't believe this relay controls the instruments but maybe I'm wrong. Any suggestions?
Thanks
Dave

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1986 300SDL