From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Wiring diagram for the connections of a Lucas D electrical system for head, side, and tail lamps.
| Identifier | Morton\M4.2\ img018 | |
| Date | 1st January 1923 guessed | |
| CONNECTIONS OF LUCAS D ALL POINTS MARKED + ARE CONNECTED TOGETHER. ALL POINTS MARKED - DITTO EXCEPT TERMINAL (DYNAMO NEGATIVE) IN R.H. BOTTOM CORNER. THESE CONNECTIONS OMITTED FOR CLEARNESS. HEAD, SIDE AND TAIL LAMPS CUTOUT A H.S H T S - + | ||