90 240 sedan 73k MILES, Headlamps are stuck on bright, can not get dimmer switch to work when I pull or push handle. Any ideas? is there a relay for this, or do I have to tear the steering column apart to fix this. What do I need for parts?

I've got a '91 240 wagon, so I'll start by saying I don't know if this will even apply there could be major differences - but I had this problem once, and it has happened a few times since on occasion.
What worked for me when my brights were stuck on was to turn the lights off completely, then pull the handle to turn the brights off, then turn the lights back on and things are back to normal.
I just thought I'd pass this along on the off-chance it might work - though I know it's such a goofy solution that probably only works with my car. Good luck.

Probably the relay - the one in a silver can, driver's side inner fender, near the battery. Try tapping it, or pull it apart. If it's shot, a junkyard one ought to be good - they don't commonly fail.

although it could be the switch it's unlikely.
Sounds like the relay is stuck/contacts welded.
Tap the relay with the power off, then pull the dip switch...if it works you've got a sticking relay.

If it doesn't work, pull the relay and bench test it or replace with a known good one (often the faster choice but a little more expensive).