TM 9-2320-363-20-1 Table   3-1. Troubleshooting    (Cont) Malfunction Test   or   Inspection Corrective   Action Step    7. Step    8. Step    9. Step 10. Step    11. ELECTRICAL   SYSTEM   (CONT) Auxiliary    Heater   Circuits   (Cont) Disconnect 24   V   auxiliary  heater    high   relay    and   24   V   auxiliary    heater    power relay   from   their   connectors. Check    for   continuity    between connectors    86    and ground. . If   continuity    is   indicated,    go   to   step   8.    If   no   continuity    is indicated, repair    ground   lead    (page 3-2). Disconnect 24    V    auxiliary heater high   relay    from   connector. Install   jumper wires    between connectors 30, 85,    and   86    to   their    respective connections at 24    V   auxiliary heater high   relay.    Check    for   +24 VDC at   connection 87    on 24    V   auxiliary heater high   relay   with   auxiliary heater    on/off   switch    closed and    auxiliary heater high/low    switch   in   high   mode. . If   +24 VDC is   present,    go   to   step    9.    If   no   voltage    is   present, replace 24   V   auxiliary    heater high   relay    (pages    4-197, 4-198). Disconnect lead   422B from    restriction   thermostat at   auxiliary    heater. Check for   +24    VDC at restriction thermostat. . If    +24 VDC is   present,    go   to   step    10.    If   no   voltage    is   present, repair    lead    422B (page    3-2). Disconnect 24    V   auxiliary heater    power    relay    from   connector. Install   jumper wires    between connectors 30,    85,    and   86    to   their    respective    connections at 24   V   auxiliary heater power    relay   with   auxiliary heater    on/off   switch   closed. Check    for   +24 VDC at   connection    87   on   24    V   auxiliary    heater    power relay. . If   +24 VDC is   present, go to   step    11.   If   no   voltage    is   present, replace 24    V   auxiliary    heater    power    relay    (pages    4-197, 4-198). Disconnect lead   422C from   overheat    thermostat switch.    Check    for   +24 VDC at   lead    422C. . If   +24 VDC is   present,    repair    auxiliary    heater    (notify   direct support    maintenance). If   no   voltage is   present, repair    lead 422C (page    3-2). 2. AUXILIARY HEATER INDICATOR LIGHT NOT OPERATING, HEATER OPERATING NORMALLY. Step    1. Remove lamp    from    socket    (page    4-190). Check    for   continuity   between contacts    of   lamp. . If   continuity    is   indicated,    go   to   step   2.    If   no   continuity    is indicated, replace lamp   (page    4-190). 3-77