1-16. ELECTRICAL SYSTEM.-Continued TM     10-3930-643-10 (1)    Alternator    (l). Maintains    the    voltage    charge    in    the    battery. (2)     Voltmeter     (2). Located    on    left    instrument    console.    With    starting switch    on    RUN,    pointer    registers    in    low    green    area    and    indicates    condition    of batteries.    With    engine    running    and    starting    switch    on    RUN,    pointer    registers    in high    green    area    and    indicates    if    the    alternator    is    producing    electric    current. (1)    Headlights    (1). Two    sealed    beam    type. Lights    (1)    provide    low    beam, controlled     by     the     vehicle     light     switch     assembly. (2)    Front    service    lights    (2). Two    sealed    beam    type    for    normal    forward illumination.    Controlled    by    the    front    service    light    switch. (3)    Rear    service    lights    (3). Two    sealed    beam    type    for    rear    illumination controlled    by    the    rear    service    light    switch. (4)    Front    blackout    light    (4). Provides     forward     blackout     illumination during    tactical    operations. T A 3 2 7 9 0 2 1-17