Battery Warning Light; Voltmeter Gage - GMC 2007 Sierra 1500 Pickup Owner's Manual

Battery Warning Light

The battery display will also stay on while the key
is in RUN until the engine is started.
If the light stays on after starting the engine it
could indicate a problem with the generator drive
belt, or some other charging system problem.
Have it checked right away. Driving while this light
is on could drain the battery.
If you must drive a short distance with this light
on, it helps to turn off all your accessories, such as
the radio and the air conditioner.
If this light comes on
when the engine is
running, there could be
a problem with the
charging system.

Voltmeter Gage

While the engine is running, this 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.
When the engine is not
running, but the ignition
is in RUN, this gage
shows your battery's
state of charge in
DC volts.
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