As other have said previously in this forum the fuse can be difficult to
find as its on the back of the fuse panel often hidden beneath all of
the wires.  You have to carefully move the wires to find the fuse.

On a European car the fuse panel can be accessed by swinging down the
glove box. I believe that on a US car it may be behind a panel in the
drivers foot-well.

The fuse is 20Amps and yellow in colour.

If the black box was on the back of the fuse panel then I suspect that
you've just replaced the central timing module. It's responsible for the
time control elements for the heated rear windscreen, interior lights
and intermittent wiper operation. The module also activates a warning
buzzer/chime  for lights left on and,  on a car with automatic
transmission,  it activates a warning if not parked with the selector in
the P position.