1. Principle of low beam lamp control
When the light switch is in the headlamp position, the terminal 8# of the light switch offers
the light control switch’s 6# terminal the electric power. When the light control switch is in the
low beam position, the switch will turn on the terminals 6# and 5# to make the low beam relay
close and thus light up the low beam lamp.
2. Principle of high beam lamp control
When the light control switch is in the headlamp position, the switch will connect the power
supply from the terminal 8# of the light switch and the terminal 4# of light control switch, which
makes the high beam relay close and thus lights up the high beam lamp.
Right High Beam
Right Low Beam
Left High Beam
Left Low Beam
Light Switch
Light Regulating
Switch
High Beam Indicator
High Beam
Relay
Low Beam
Relay
Terminal
Light
Control
Lamp
OFF
Headlamp
Power
Clearance
Lamp
15a
Ka
30a
15
30
Power
Clearance
Lamp
Headlamp
