Battery Warning Light; Voltmeter Gage - Chevrolet Silverado 2004 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 with this light displayed could drain
your battery.
If you must drive a short distance with this light
displayed, it helps to turn off all your accessories, such
as the radio and the air conditioner.
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If this light is displayed
when the engine is
running, you may have
a problem with your
charging system.

Voltmeter Gage

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