This may be a relay, may be wiring, but I'm puzzled by the facts here. They are:
1995 940, original owner, wagon. I know the high beams work ONLY in #3, ON, position. But in the ON position, nothing works. My high beams do work in #1 and #2 positions, but not where they are supposed to work: in the ON position which turns everything OFF. in 1 and 2 the high beams are working, but Won's Stay On.
2. I changed the relay with a NAPA part that looked perfect, including the switch diagram on the side. matched the original "K" Bosch part.
3. High beams worked! and stayed on! BUT
4. headlights would NOT turn OFF.
5. Pulled, cleaned, sanded and dilecticized the switches on both the dash switch and the pull handle stick. Same result.
6. One interesting thing though: even though there are five male connectors and all line up properly, there is a tiny copper piece in a horizontal slot that goes to an empty corresponding slot. On some images for the switch it seems the "little copper part" might be a broken off part, but what would it connect to? there's no wire corresponding to the slot where the little copper nub is.
7. The high beams do work, manually, but take my finger off the pull stick, jumps right back OFF. When I put in the Napa part the high beams totally worked as normal, but hen the headlights would not turn off. (*same point in #4 above, underlined.)
Ideas?

 

2. Probably the wrong wiring in the relay (wrong part)
3/4 . Because it's the wrong relay
5/6
7. That's the way they are supposed to work - when no power is coming from the yellow white wire from the switch. That's the "flash to pass" function.

Do you have power at the 3 yellow/white wires at terminals 4 and 5 on the switch with switch turned on? For low beams power goes from the switch to the bulb out relay to the 2 fuses then to the bulbs. High beams - there are 2 relays
involved 2/37 and 2/50. Here's a wiring diagram and function diagram from Volvo

 

Thx, Hoonk, I am aware of the Yellow/white, but not aware of What changed. I know you can't necessarily SEE every break; not everything is hot and obviously fried.
Do you have an understanding from my situation about What the Right Relay IS? It's NOT the "K" relay called Headlight relay? If not, what is it? Number, Letter, name? Grateful, D Day

 

Right, Hoonk, Trying the six parallel spades of the Bulb Out Relay instead of focusing on the K relay. Thanks for the tip. Pretty sure that's the path. Though my ability to read wiring diagrams is on par with my arabic. D Day