Voltmeter Gage - Chevrolet 2008 Tahoe Owner's Manual

Voltmeter Gage

When the engine is running, the gage shows the
condition of the charging system. The charging system
regulates voltage based on the state of the battery
for improved fuel economy and battery life. 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 gage may also read low during the
fuel economy mode, this is normal.
3-44
When your engine is not
running, but the ignition is
on, this gage shows
the battery's state of
charge in DC volts.
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 full power.
If there is a problem with the battery charging system,
this light will come on or the SERVICE BATTERY
CHARGING SYSTEM DIC message will display.
See DIC Warnings and Messages on page 3-65
and Charging System Light on page 3-43 for more
information.