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Hi, what year and model is your Mercedes? Can you post the vin number?
Hi Tim, it's very common for the instrument cluster to fail and flash when the key is on. I would first remove, clean and inspect or replace all of the fuses in the front and rear fuse boxes. If you still have trouble with the instrument cluster I'd replace the cluster. It is not normal is that the interior lights flash. Can you give me more information on the interior lights?