The floor-mounted dip-switch used until 1970.
From 1970 a column switch was used. This from a UK 1973 model, showing the switch in the 'main beam' position,
'dip' and 'flash' contacts both open.
Showing the switch in the 'dip beam' position,
'main' and 'flash' contacts open.
Showing the switch in the 'flash' position,
dipped beam contact still closed (but the spring contact pushed further than before), 'main' contact still open.
Showing the switch in the 'dip beam' position with the contacts labelled as to which colour wire goes where.
A general view showing the plastic springs (and indicator/turn-signal auto-cancel fingers) on the switch body. The 'Dip'/'Main' snap-action spring gives the positive switching action between dip and main positions. The 'Flash' spring gives a positive return to 'Dip' from 'Flash'.
Switch in the 'main beam' position, headlamp wire and main beam contacts closed:
Switch in the 'dipped beam' position, headlamp wire contact between main and flash:
Switch in the 'flash' position, headlamp wire and flash contacts closed: