GMC sierra 2002 User Manual
2-102
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.
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.
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.
problem in the electrical system. Have the vehicle
serviced as soon as possible.
Shift Light (If Equipped)
This light is used on
some models with
manual transmissions.
some models with
manual transmissions.
The SHIFT indicator light will help you get the best fuel
economy. See “Shift Light” or “Shift Speeds” in the
index for more information.
economy. See “Shift Light” or “Shift Speeds” in the
index for more information.