Chevrolet 1999 Silverado 1500 Pickup Owner's Manual page 145

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Voltmeter
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.
When your engine is not
running, but the ignition is
in RUN, this gage shows
your battery's state of
charge in DC volts.
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.
Shift Light (If Equipped)
This light is used on some models with
manual transmissions.
The SHIFT indicator light will help you get the best fuel
economy. See "Shift Light" or "Shift Speeds" in the
index for more information.
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Silverado 1999

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