HELP!! My car won't shut off!!!!

[bronson@inwave.com (Nate Mellom)]

Once again, elecrical gremlins show up.....
We took the '81 out for a spin today, and after one of my stops, walkig 
back to the car, I saw my reverse lights were on (this was coming out of 
the store, keys in my hand).  I had backed in, so they should be on, if 
the key was on.  Got in, the dash lights were on and my voltage gauge 
said appx. 10v.  When this happened before, about a month ago, I swapped 
the ignition switch and it was all good.  Started it up, took off, 
everything was fine.  Got to the next place, tried to turn it off, and 
it kept running!!  I tore apart my steering column, pulled the plug off 
the back of the ignition switch, and IT STILL RAN!  I had to pull the 
pump relay to get it to shut down.  Even with the key out of the 
ignition, pump relay pulled, I could still a) turn on the turn signals, 
but not the wipers, b) when the horn buttons were pushed I could hear 
the relay click, but no horn, c)the fan wouldn't run.  I replaced the 
switch again, but it didn't do any good, the only way to shut my car 
down is to pull the pump relay.  When I put the steering wheel back on, 
if I tightened the nut down to far (the wheel still being loose) or 
turned the wheel just right, the horn would honk, again, with the key 
OUT of the switch.
Where do I begin looking for problems?  I can't drive the '84 yet (no 
exhaust), so I need to get it fixed quick.
BTW, I had to pull the neg. battery terminal to get my dash lights to 
shut off.....

HELP!!!!!!!
Nate
'81 (REALLY wants to run)
'84