97 Ford Taurus: 4 ways and turn signal lights not working

About a month ago the turn signals stopped working (at first it would work
sometimes, but not others, but now not at all). During that process I
discovered the 4 ways didn't work either, but for how long I don't know
because I never used them. I put in a new flasher in (generic) that worked
for approximately 3 weeks. Then yesterday it stopped working. When the car
tries to signal there is 1 click and then nothing. I've tried 2 more
flashers, but same thing for each 1 click and nothing else.

What do you suppose the problem could be?

Other symptoms that may be unrelated or not:

1) for a long time (over a year) a few times a week the symbol for the door
open/ajar comes on and stays on for about 2 minutes of driving. All doors
are firmly closed.

2) About 2 weeks ago the APS symbol comes on when first starting the car and
may stay on for a few minutes. This too happens irregularly.

3) For as long as I can remember the seat belt symbol comes on and stays on
for a few minutes (sometimes longer) even when I have the seatbelt fastened.
Again this does not happen every time.

My main concern is getting the signal lights working. It is too cold to be
driving around with the window open, and having to stick my arm out. Besides
nobody seems to know what the signals mean anyway, and just give me the
finger because they almost rear-ended me.

Any help appreciated,
PS: I went to Ford but both Dealers I called will not give suggestions other
than 'let's get you into servicing', at $75hr plus plus plus. If I could
afford that I wouldn't be driving a 97!

Pah