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GMC 1997 Savana Van Owner's Manual page 122

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Voltmeter
When your engine is
not
running, but the ignition is
on (in the RUN position),
this gage shows your
battery's state of charge in
DC volts.
When the engine is running, the gage shows the
condition of the charging system. Readings between the
low and high warning zones indicate the normal
operating range.
Readings
in
the low warning zone may occur when a
large number of electrical accessories
are
operating
in
the vehicle and the engine is left at an idle
for an
extended period. This condition is normal since the
charging system
is
not able to provide full power at
engine idle. As engine speeds are increased, this
condition should correct itself as higher engine speeds
allow the charging system to create maximum power.
You can only drive for a short time with the reading in
either warning zone. If you must drive, turn off all
unnecessary accessories.
Readings in either warning zone indicate a possible
problem in the electrical system. Have the vehicle
serviced as soon as possible.
Electronic Road-Speed Governor
(Gasoline Engines) (Option)
This optional system automatically controls vehicle top
speed. The system controller receives a signal from the
vehicle speed sensor and reduces power when the
vehicle speed reaches the maximum 65 mph
(
105
k m / h )
governed speed.
2-60

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1997 savana