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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).
Instructions for fuse replacement and fault finding in a junction box.

Identifier  ExFiles\Box 26\2\  Scan126
Date  19th July 1917 guessed
  
-12- Contd.

JUNCTION BOX.

When occasion demands the replacement of a
fuse in this box, spares will be found in the little
container inside the cover, and care should be taken that the
wire is straight in the fuse holder and firmly gripped.
Carefully inspect these fuses occasionally, and renew in the
event of any irregularity.

The positive or right hand fuse will be the
morelikely to become melted in service, as the permanent
earth connection of the electrical system is effected on
the bar supplied with current through this fuse. Failure
on this fuse indicates the occurrance of an earth upon
some conductor (coloured black on diagram) in direct
connection with the negative terminal of the battery or
else a direct short circuit from bar to bar which may take
place in carelessly removing or replacing the cover. It
is unlikely that the negative or left hand fuse will go
but such would indicate an earth on the negative bar in the
box, or in connections thereto, or again, a direct short
circuit from bar to bar.


Contd.
  
  


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