Chevrolet B7 2001 Owner's Manual page 40

Voltmeter
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 may not be able to provide full power
at engine idle. As engine speeds are increased,
this condition should correct itself because higher
engine speeds allow the charging system to create
maximum power.
When your engine is not
running, but the ignition is
on (in START), this gage
shows your battery's state
of charge in DC volts.
You can only drive for a short time with the reading in
either warning zone. If you must drive, turn off all
unnecessary accessories.
Readings in either warning zone indicate a possible
problem in the electrical system. Have the vehicle
serviced as soon as possible.
Range Inhibited Warning Light (If Equipped)
The warning light should come on briefly, as a check,
when you turn on the ignition.
For detailed information on shift inhibit limitations, see
the Allison Automatic Transmission Operator's Manual
in your vehicle.
If your vehicle is equipped
with an automatic
transmission, this light
could turn on indicating that
transmission range shifts
may not occur.
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