I actually have a very good idea what is wrong here.

Tuesday morning (5:25 AM), I started the car, let it warm for a minute and then switched on the headlights to head off.

No headlights but the clearance lights are on. I cycled the floor dimmer a couple times and the brights came on. Clicking the switch again put me back in black. A few taps on the side of the switch finally brought my headlights on and so off I went.

Same problem this morning, but much worse. I could not get my lights to stay on without resting my foot on the switch. Not a workable solution with a manual gearbox.

Weighing my options, I set off with my clearance lights on and my front spotlights/fogs on. This worked in a desperate pinch, but it is obviously not a good alternative.

My guess is the dimmer switch has bitten the bullet (no Ron, I've never oiled it) and considering some of the odd wiring down on the floorboard, I suspect this is not even the original volvo switch. I do not have a spare floor switch but I was planning to make the signal-stalk conversion anyway.

So.. my question (finally). I've seen this behavior before with a signal-stalk switch. My uprated 220 would also do this occasionally. I've got a nagging doubt that this problem is something more/else than just a failing floor switch.

If it is something more/else, what are the likely culprits?

Relay (are they even stock)?
Wiring (possible)?
Bad ground?
Wrong color car (this one is green)?

Thanks as always.