TM 10-3930-643-10 2-20. OPERATING PROCEDURES. a.     Starting     the     Engine. N O TE Check    log    book    to    determine    period    of    non-operation.    If engine     has     been     idle     for     30     days     or     more     the     turbo- charger    must    be    primed    before    starting    engine. N o t i fy organizational maintenance. (1)    Before    entering    cab, turn    the    Master    Disconnect    switch    ON. Do    not use    foot. T A 3 2 7 9 34 2 - 32