Volkswagen Beetle 1972 Maintenance And Repair Manual page 92

c. Head Lights
With the ignition switch on. polling the light switch knob all (he way Out supplies
power to ihe headlights as well as id the Park, Side and License Plate Lights The
headlights are switched from high to tow beam and back by polling back on the turn
signal and headlight dimmer switch Switching to high beam illumniflM the high
beam warning light in the speedometer The headlights are protected by four fuses
in the fuse bon
d. Backup Lights
When backing the car, placing the gear shift in reverse closes the backup light
swiich illuminating Ihe backup lights The backup light circuit is protected by an
inhne fuse.
Instruments
Fuel Gauge
The fuel gauge is a thermo electrical indicator located In the speedometer It indicates
the amount of fuel available by a needle moving across a scale. The needle is moved in
one direction by a spring and in the other by the heating and bending of a bimetal strip.
The bimetal strip is heated by current flow through a coif wrapped around it. Current is
provided by a vibrator and controlled by the variable resistor in the fuel gauge sending
unit In the tank The fuel gauge system is protected by a lose m the fuse box
Oil Pressure Warning Light
A red oil pressure warning lighi is also located m the speedometer It illuminates when
the ignition switch ts turned on and siays lit until the engine has started and oil pressure
is built up Sufficient pressure displaces a diaphragm in the switch and turns the light ofl
The light will come on any lime the ignition switch is on and the oil pressure drops The
oil pressure light is protected by a fuse in the fuse bo*
Horn
The horn is a single tone signal It is operated by the horn button on lhe steering wheel
Pressing the bullon sends current to a breaker mechanism within The horn which vibrates
a diaphragm to produce sound The horn system is protected by a fuse in the fuse bo*.
Horn will not blow with the igniuon switch off
Windshield Wiper
The windshield wipers are driven by a single electric motor Moving the wiper switch lever
to the first stop produces a single slow wiping sweep unless the lever
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held in position
When the lever is released it centers and the wipers park. When the wiper switch lever is
moved to the second posit ion. the wipers continue to sweel slowly until the lever is moved
to turn them off In the third position the wipers sweep rapidly until the lever rs moved to
turn them off In. each mode the blades park automatically The wipers wUi not operate
unless the ignition switch is on. The system is protected by a fuse in ihe Fuse box
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