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sufficient current to light the bright filaments in side (parking) lamp and rear flasher lamp is passing through the windings of the electro-magnet to close contacts (B). The flashing pilot lamp, therefore, gives the driver a clear indication that the direction signals are working correctly. It will be noted that in order to maintain the desired rate of flashing (British Ministry of Transport regulations, 60-120 per minute) the filaments of the front and rear lamps are “pre-heated” via the resistance wire during “out’s period of the flash.
Headlamp flasher switch (if fitted)
The direction Indicator switch also incorporates the switch for flashing the headlamps, this is achieved by moving the lever stalk towards the steering wheel and in so doing an Insulated spring-loaded plunger, operated by the Inner end of the lever, is depressed to make switch contact so that both headlamps Illuminate and will
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remain so until upward pressure on the lever is released. When the lever is released the switch will return to the OFF position under the influence of its spring and the headlamps will extinguish.
Headlamp flashing can be accomplished irrespective of the lever position, i.e., whilst using either direction Indicator.
When the headlamp flasher system is functioning correctly, each application of the switch lever in the upward direction will illuminate both headlamps.
Should either headlamp fall to illuminate a check is to be made to ensure that the connections to the headlamp are secure, if on inspection the connections are found to be satisfactory the lamp unit is to be changed for one which is known to be serviceable.
In the event of both headlamps falling to illuminate when the switch is operated, the circuit from the switch to terminal I on the fuse unit is to be checked. If after test the switch is found to be defective, it must be renewed as the switch is irreparable.
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