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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).
Page describing the dynamo charging system and lighting switch connections.

Identifier  ExFiles\Box 26\2\  Scan041
Date  6th October 1919
  
R.R 235.s 100 T. (R.P. 846. 6-S-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 3460.

Contd.

-6-

EFC2/T6.10.19.

If, however, the dynamo speed should be allowed to fall, and its E.M.F. to drop below that of the battery, a reverse current from the battery traverses this series coil and finally becomes of sufficient magnitude to counteract the effect of the shunt coil, at which moment the main contacts fall apart and no further discharge of the battery can take place.

The three terminals on the right hand side of the charging switch are respectively from left to right, negative, field, and control of the dynamo. The six terminals on the left hand side of the charging switch are according to diagram above, in which it will be seen that the battery positive and dynamo positive terminals are permanently connected together.

The remaining connections in the box, e.g. those corresponding to the head, sidemand tail lamps, are omitted in the wiring diagram for the sake of clearances, but it should be understood, however, that each of the two switches marked H and S respectively are three-point switches and such that the H switch is capable of switching on head and tail lamps without the side lamps and the S switch is capable of switching on the side lamps, and tail lamps without the head lmaps. One point of each of these two switches is connected to the battery negative terminal. the other four points, two of each, are connected to the corresponding head, side, and tail lamp terminals, thus in connecting the lamps up to the board the head, side and tail lamps are respectively connected between H and +, S and + T and +.

Contd.
  
  


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