JLG 680S Operator Manual - Manual (Page 61)

SECTION 3 - MACHINE CONTROLS AND INDICATORS
3121678 – JLG Lift – 3-19
12. Drive Orientation Indicator
When the boom is swung beyond the rear
drive tires or further in either direction, the
Drive Orientation indicator will illuminate
when the drive function is selected. This is a signal for the
operator to verify that the drive control is being operated in
the proper direction (i.e. controls reversed situations).