Currently I work also on a Jetsonic JS series B.
Wiring ist according to JS-1.
big red plus + small red plus = rotators lights and spin
big red plus + small red plus + thin black = front cut-off works perfect
big red plus + thin blue = all 4 lamps flash
But the problem is, that they do not go back to the starting position/ zero postion.
So the 4 lamps flash in every direction but not to the front or the rear. Because they start flashing on the last position they have stopped turning.