JLG G6-23A Operator Manual - Manual (Page 39)

Section 3 - Controls and Indicators
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14. Engine Pre-Heat Indicator: Illuminates with ignition key in position 1. Light goes
out when start temperature is reached. At temperatures below 32°F (0°C), do
not start until light goes out.
15. Engine Oil Pressure Indicator: Illuminates when low oil pressure occurs. Stop
engine immediately.
16. Battery Charge Indicator: Illuminates with the ignition key in position 1 and
briefly during starting. Illuminates during operation when battery is at low
charge.
CAUTION
EQUIPMENT DAMAGE. When a red light illuminates and a warning tone is
heard, immediately bring machine to a stop, lower boom and attachment to
ground and stop the engine. Determine cause and correct before continued use.