Bright, well adjusted head lights are necessary for safe vehicle operation at night. The main beam provides a bright light suitable for driving on open country roads.
The dip beam only is used in built up areas. In country areas, the dip beam is used whenever oncoming traffic could be dazzled by the main beam.
The headlight circuit consists of:
When the headlights are switched on, current is supplied from the battery, through the fusible link and fuse, across the closed switch contacts to the dipper switch.
In the dip beam position, electrical current can flow from the dipper switch contacts through the low beam relay winding to ground.
This creates a magnetic field that closes a set of contacts. Closing the contacts allows electrical current to flow from the battery, through the fusible link, to the relay contact. From the closed relay contacts the current flows to the light filaments and then to ground.
The park and tail lights are also in operation when the headlights are switched on.
