Blinking 2000 BMW 325 low beams

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My low beams blink off and on in one second intervals. The blinking stops if I use a turn signal. Any ideas of the cause/solution?

It’s most likely to be the “multi-function” switch which controls the high and low beam headlights, flashes those lights for passing on the autobahn, and operates the directional indicators, which some drivers don’t seem to use.

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