No one answered about this, so I took the Taurus to the
mechanic because it needed a new heater core anyway.
The mechanic said that the problem was caused by the
light module - the timer inside the light module, so this
was not an electrical fuse or physical connection-type
problem, but an electronic problem inside a module.
This is good to know, because my dad's Ford van
has the exact same problem - lights not working, even
though all fuses are good.

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