JLG G12-55A Operator Manual - Manual (Page 45)

Section 3 - Controls and Indicators
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7. Warning and Check Engine Lights (Perkins and Cummins Only): Any
combination of illumination indicates an engine fault and/or a parameter that is
outside of acceptable range. Engine may derate or shutdown.
8. Steer Select Switch: Three positions: 4-wheel circle steer, 4-wheel crab steer
and 2-wheel steer. See page 3-16 for details.
9. Park Brake Switch: See page 3-7 for details.
10. Horn Button: Depress button to sound horn.
11. Auxiliary Electrics Switches (if equipped): Enables functions of attachments that
require auxiliary electrics. See Section 5 - Attachments for approved
attachments and control instructions.
12. 3-in-1 Gauge & Display (Cummins) (Perkins S/N 0160037186 thru 0160039451
excluding 0160039394 & 0160039397):
a. Engine Coolant Temperature Gauge
b. Engine Oil Pressure Gauge
c. Fuel Gauge
d. Display - Displays engine operating hours, battery voltage and engine rpm.
Engine fault codes displayed when detected. See Service Manual for
details.