Our '84 300D has developed a problem, and we know where it is but not quite how to get at it or tackle it.

The high/lo beam switch on the turn signal stalk has taken to turning the lights off completely. Whenever. At random. Pull the stalk back (towards the driver) and they come back on, so the stalk is somehow working it's way forward (with no help except road vibration) to a neutral position "between" low and high. It's really unnerving on winding, hilly, DARK country roads to have the lights suddenly go out at 60 mph!

What do we tear apart, and how, so we can make it stop it's wandering?

I have been searching the forum for hours and can't find an answer. If you refer me somewhere, please give me a link or a thread number -- for some reason, since the forum's format change, I can only do single word "searches", which is pretty frustrating. I hope that's a bug that'll be worked out shortly, but in the meantime, I need more specific direction to get to an answer.

Thanks for any ideas or direction you can give.

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Anthracite 1980 300D -- 64k original miles with a new engine, on the road again!
Silver 300D -- second owner, Sunny's old baby, Ilse, 210 miles,
Having to thin the herd….
Silver 1983 300SD -- second owner, 325k miles
Gold 1981 300D -- well-traveled, solid little car
Beige 1984 300D -- 292k miles, grease machine, parting out
Seafoam green 1981 300SD -- 250k, windshield frame damage
too many assorted w123 & w126 cars, parts cars, and extras