TM-9-2350-277-10 Operator Manual M113A3 M577A3 M1064A3 M1068A3 M58 Download
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TM 9-2350-277-10 DESCRIPTION AND USE OF OPERATOR’S CONTROLS AND INDICATORS — Continued 0004 00 0004 00-29 Change 3 FUNCTION CONTROL OR INDICATOR HI-LO SWITCH Controls operation of coolant heater. Controls engine coolant heater output. COOLANT HEATER LIGHT RUN-OFF-START SWITCH Indicates that coolant heater is on. KEY PRESS-TO-TEST SWITCH Table 22. ENGINE COOLANT HEATER CONTROL BOX When switch is pressed, light will come on if light bulb is good and if power is coming into the control box.