
486 LIGHT AND HEAVY VEHICLE TECHNOLOGY
Figure 28.12 Basic solenoid circuit (Seddon Atkinson)
1 starter switch
2 hold-in windings
3 contacts
4 pull-in winding
5 battery
S switch
B battery
M motor
28.3 LIGHTING, SIGNALLING AND SCREEN
WIPING
Headlamp beam setting
The purpose of setting the headlamps in service is to
ensure that they provide the maximum help to the
driver with a minimum of discomfort to oncoming
drivers, and also to ensure that their lighting patterns
comply with Department of Transport regulations.
Headlamps may have either a symmetrical or an
asymmetrical dipped beam, the latter system having
been originally introduced into Europea ...