Voltmeter Gage; Up-Shift Light (Manual Transmission) - GMC Sierra 2005 Owner's Manual

Voltmeter Gage

When the engine is running, the gage shows the
condition of the charging system. The gage may
transition from a higher to lower or a lower to higher
reading, this is normal. Readings between the low and
high warning zones indicate the normal operating
range. The voltmeter gage may also read lower when in
fuel economy mode. This is normal.
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
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When your engine is not
running, but the ignition is
in RUN, this gage
shows your battery's state
of charge in DC volts.
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.
Up-Shift Light (Manual
Transmission)
The shift indicator light will show you when to shift to
the next highest gear, and will help you get the best
fuel economy.
This light is used on some
models with manual
transmissions.