TM 9-2320-363-102-2.INSTRUMENT PANEL (Con’t).KeyControl or IndicatorFunction17Mechanical SwitchSpring-loaded, two-position switch. Operates the(All Except M915A2same as mechanical switch on other model trucks.and M916A1)Refer to item 17 in subparagraph a(3).18Auxiliary SwitchFour-position switch. Operates the same as auxil-(All Except M915A2iary switch on other model trucks. Refer to item 18and M916A1)in subparagraph a(3).19Engine (Jake) BrakeSelects number of engine cylinders desired forSelection Switchesbraking action (two, four, or six cylinders). Turn onleft switch for two cylinders, right switch for four cyl-inders, and both switches for all six cylinders.2-10
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