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Old 11-07-2019, 12:21 PM
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some of the wiring diagram attached.

The diagram shows #11 as being where the power comes from.

Looks to me like if you turn the light switch and take connector C151 and put the + probe of the volt meter on #11 and the negative probe on #15 (the ground). If you get no power try the negative probe a different ground.
If you are still getting no power then it is in the light switch or the connector to the light switch.

If when you moved to a different source of a ground you got power then it is the #15 to ground that is the problem.
Attached Thumbnails
W123 Instrument Cluster Lights Not Working (it isn't the rheostat)-light-switch-instrument-cluster-lights.jpg  
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