TM 9-2350-247-10DESCRIPTION AND USE OF DRIVER’S CONTROLS AND INSTRUMENTS — Continued 0004 000004 00-7Turns ON and OFF all exterior driving and instrument panel lights.DRIVING LIGHTS SWITCHLight comes on when headlight high beams are on.HEADLIGHTS HI BEAMINDICATOR LIGHTTable 7. DRIVER’S INSTRUMENT PANEL - M548A1 (Continued)Press switch to sound carrier horn.HORN SWITCHKEYLight comes on when transmission oil temperature is too high for safeoperation.TRANS OIL HIGH TEMPWARNING LIGHTCONTROL OR INDICATORLight comes on when coolant level is too low for safe operation.FUNCTIONDIFFERENTIAL OIL HIGHTEMP WARNING LIGHT
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