Just today, My 300e has done the same thing. Bussing in the multifunction relay box, stops buzzing when the indicators are turned on, all instruments dead. Is it likely that the faulty relay has blown the cluster fuse? (all fuses in the plenum chanber fuse box are intact, perhaps one in the cluster has gone?)
Any ideas guys?

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Andrew
300e 294,000mi
380sel 185,998mi
380se 309,980mi