I worked on the odometer last week. Found out the two cluster lights didn't work. I pulled the cluster and rotated the bulbs ( they aren't stock ), and one lit. Next try I didn't get the cluster in far enough and knocked out all the tiny interior lights when I turned the switch. Changed the fuse, and nothing lights. Any other place to look?

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1984 MB 300SD Turbo

Which tiny interior lights are you talking about?

Some have bulbs and some use fiber optic with a single bulb.

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Sam

84 300SD 350K+ miles ( Blue Belle )

Heater controls, windows.

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1984 MB 300SD Turbo

Hmmm.....sounds like a wire may have come off of the dimmer rheostat. It should have a gry/vio wire for supply and two gry/blue wires coming off of it. One to the cluster illumination and one to a common connection point (C124) that supplies power to multiple lights.

Here is a source for a diagram, that can be printed, to help you out:
Mercedes-Benz 126 Service Manual Library

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Sam

84 300SD 350K+ miles ( Blue Belle )

Success!!! Put new LED light in and fuse didn't blow. Must wait till dark to see if indexed correctly. Strange. Thanks for trying,Blue.

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1984 MB 300SD Turbo