Charging System Light; Voltmeter Gage - GMC 2007 Yukon Denali Owner's Manual

Charging System Light

It should go out once the engine is running.
If it stays on, or comes on while you are driving,
you may have a problem with the charging system.
It could indicate that you have problems with a
generator drive belt, or another electrical problem.
Have it checked right away. Driving while this
light is on could drain the battery.
When this light comes on the DIC will also display
the SERVICE BATTERY CHARGING SYSTEM
message. See DIC Warnings and Messages
on page 254 for more information.
If you must drive a short distance with the light on,
be certain to turn off all your accessories, such
as the radio and air conditioner.
The charging system
light will come on briefly
when the ignition is
on, but the engine is
not running, as a check
to show you it is
working.

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.
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 your engine is not
running, but the ignition
is in RUN, this gage
shows your battery's
state of charge in
DC volts.
233