'87 300TD - Sudden loss of all instrument lights (cluster, shifter, vent lights, ....).Hoped it was a fuse. AND IT WAS! Unfortunately, replacement fuses blow as soon as light switch is turned on. Opinion?
Light switch versus relay vs. short in one of multiple instrument lights?
Try unplugging both tail light assemblies in the rear and switch on the lights. It is not uncommon for the steel bussbars in them to come loose and short out the parking light circuit (which also feeds the instrument lamps). This will rule them out as the cause.
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