Voltmeter Gage - Oldsmobile Bravada 2002 Owner's Manual

Charging System Indicator 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 your battery.
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.
2-70
The charging system light
will come on briefly when
you turn on the ignition, 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. 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. 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 reading in
either warning zone. If you must drive, turn off all
unnecessary accessories.
When your engine is not
running, but the ignition
is on (in RUN), this gage
shows your battery's state
of charge in DC volts.