Chevrolet 2007 Silverado, Owner'S Manual

Page: 261 / 688

Voltmeter Gage
Your vehicle may have
a voltmeter gage.
When the ignition is in RUN, this gage indicates
the battery voltage.
When 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. If the vehicle is
operating outside the normal operating range, the
charging system light will come on. See Charging
System Light on page 260 for more information.
The voltmeter gage may also read lower when in
fuel economy mode. This is normal.
Readings outside the normal operating range may
also occur when a large number of electrical
accessories are operating in the vehicle and the
engine is left idling 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
readings outside the normal operating range. If
you must drive, turn off all unnecessary
accessories.
Readings outside the normal operating range
indicate a possible problem in the electrical
system. Have the vehicle serviced as soon
as possible.
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