6v BA15 LED headlamp bulbs?

[David Cochrane]

There seem to be two versions of the CAV push-button which were fitted to Austin 7s; both have 16-8-0-8-16 ammeters and buttons marked DYN LTS DIM. The earlier version works with single filament bulbs and the DIM button switches the filaments from being connected in parallel to being connected in series; this version is shown in the early Handbooks' wiring diagrams. The later version of the 3-button switchpanel has the right-hand switch configured to work with twin-filament bulbs.