2005 Chevrolet Blazer Owner's Manual - Page 153
2005 Chevrolet Blazer Manual
Page 153 highlights
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. Readings in either warning zone indicate a possible problem in the electrical system. Have the vehicle serviced as soon as possible. Up-Shift Light United States Canada Shifting when the indicator light is on will help you get the best fuel economy. See "Up-Shift Light" under Manual Transmission Operation on page 2-28. 3-27
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