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On my '90, the tail, park, and dash lights aren't working correctly. When the headlight switch is pulled to the first position, nothing happens. When pulled all the way out, the headlights illuminate - nothing else.
But, if the switch is held between the two positions, a click is heard under the hood and the tail, park, and dash lights illuminate and work perfectly.
I tried a new FoMoCo headlight switch to no avail. All the fuses are good.