Actually the glove box bulbs don't fit the fuseholders - at least not on an 85 W123

But I have made some progress. What I did, is remove the cluster and unplug the multi-pin plug on the rear.

Checked #1 fuse holder with meter, and it seemed short had gone. Put in a fuse and front/rear running lights, warning buzzer, shift bulb all worked.

Checked cluster lighting circuit on bench for a short, but it seemed fine.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5