One of the advices I got from JFP in PA when I was troubleshooting my litronics was to ensure that they have a good ground otherwise they could act funny. My trouble fixed when I replaced my headlamp switch so I didn't go any further but if you have the Bentley manual it shows where the ground points are for the different systems in the car, including the headlights/litronics. (Are they retrofit or factory?)
I am not sure if those are the grounds to which he was referring, but it could possibly be the basis for a new search.
Good luck!
Steve
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