Thank you all for the reply. However "self-cancelling" are not quite what it is. Vern, your link (as well as google on the term) provides units with min. 20 seconds ON, before self-cancel. The install literature said that to change lane, unit can be MANUALLY turned off prior to the 20 seconds.
In the MB, the turn will only blink 3 times -- maybe 3 seconds tops, before cancelling -- specifically for lane changing use in traffic. That's why I thought it is going to be more like a (simple?) relay unit.
Very frustrating..
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