27-12-2022, 06:10 PM
Mike, that series/parallel arrangement was only on the very earliest cars with the first type of CAV 3-button switchpanel. The 2nd type used twin-filament bulbs (like stop/tail). Then the 2-lever Lucas switchpanel had separate sidelight bulbs in the reflectors. Unfortunately I don't know exact change-over dates - my late May 1925 car has the twin-filament arrangement.