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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).
General description of the electric lighting, starting, and ignition systems.

Identifier  ExFiles\Box 26\2\  Scan115
Date  27th February 1920
  
R.R. 199 (250T) (SD676 19-7-17) MP18086
X1995
27.2.20.

APPENDIX IX

ELECTRIC LIGHTING, STARTING AND IGNITION SYSTEMS.

A.{Mr Adams} DESCRIPTION

GENERAL.

The equipment comprises a dynamo, switchbox and junction box, a 12 volt 55 ampere hour accumulator, an ammeter, a six cylinder magneto, and the following items of Rolls-Royce manufacture :- a starter motor with electrically operated main switch and jaw clutch actuator; battery ignition, consisting of non-trembler ignition coil with ballast resistance, and combined low tension make and break and high tension distributor; and combined magneto and battery ignition steering column switch.

The wiring diagram shows these units in their approximate relative position, with their electrical connections. Some of the internal connections of the switchbox are omitted but aregiven in the connection diagram. In these diagrams positive leads are coloured red, and negative black, it being assumed that all circuits are closed. All switching is done on the negative leads, except for the main starter motor current. An earth return on the chassis frame is utilised in the case of the ignition only, otherwise the whole system is insulated. This earth is made on the positive bar of the junction box on the front of the dash at E and at the contact breaker under the battery ignition distributor.
  
  


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