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Connect the negative lead of the voltmeter to the control box terminal 'D' and connect the other lead to
the terminal 'E'.
Run the dynamo at 3,000 RPM., and watch the voltmeter reading, which should be between the limits
given below, according to the ambient temperatures.
NN.9 Mk. II SEALED-BEAM HEADLAMPS
Commencing at Chassis No. 103857, Mk. X sealed beam light units are fitted to all cars exported to
the U.S.A. The lamp housing is secured to the wing by four screws and the back-shell is retained in
the housing by a single coil spring. Two screws, each having a flange beneath its head, engage in
slotted lugs on the rim of the back-shell and bear against the lamp housing; the screws are used to
adjust the vertical and horizontal alignment. The lamp wiring passes through the housing and
terminates in a three-hole socket.
Three pins at the back of the sealed-beam unit engage the holes in the socket, and the unit is retained
in the back-shell by a lamp retaining plate that is secured to the back-shell by three screws. The lamp
rim engages two lugs at the top of the housing and is retained in position by a screw.
To gain access to the lamp unit remove the rim retaining screw and lift the rim of the locating lugs.
Slacken the three lamp retaining plate screws, turn the plate anticlockwise, and remove it from the
back-shell. Withdraw the lamp unit and disengage the three-pin plug.
To refit the lamp unit, engage the three-pin plug and place the unit in the back-shell; ensure that the
three lugs formed on the rear circumference of the unit engage the slots in the back-shell. Refit the
lamp retaining plate, press it firmly, and rotate it in a clockwise direction to the full extent of the slotted
holes. Tighten the retaining plate screws. Fit the rim over the locating lugs, press the rim downwards
and inwards, and secure it with its retaining screw.
Fig. NN.1 The sealed-beam headlamp, showing the locating lugs and adjusting screws
1. Retaining plate screw.
2. Horizontal adjustment screw.
3. Vertical adjustment screw.
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