Headlight switch. When I had identical issues, I removed the switch (take off the covers around the steering) undo a screw and the swtich slides out. It might be a little stiff and needs to slide straight on the rails to come out so take it easy. I sprayed a bunch contact cleaner inside down where the stalk enters the unit, to give the contacts a good cleaning. You can probably take it apart, but spraying the cleaner and working the switch did it for me. Been fine for 2 months now, for how long, I don't know, but a new one is something like $150..
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1994 Discovery
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