Occasionally and currently, my headlights start flashing when in the 1,2,4 and brights positions(the control knob having positions 1-5, 3 being off...get it?), basically on any setting but regular headlights. The last time it happened, it was raining, this time I just had some work done at the shop(glowplug and malfunctioning antennae diagnostics/repairing). Any clues out there?
Thanks,
Alex

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1984 190d 5 speed manual