Hi there,
I might not be of much help, but based on your description, only the electric ilumination seems to be left, if you have disconnected everything else properly. Was there anything not working like the hazard switch or the vanity light with #2 in? That might give a hint where to search. After that, you have to follow the wires and look for any broken insulation and test the switches etc. Somewhere is a short to ground that you need to find. The voltmeter has to work also.
Good luck

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Reinhard Kreutzer
1987 420 SEL (126)