TM 9-2320-363-20-1 Table   3-1. Troubleshooting (Cont) Malfunction Test   or   Inspection Corrective   Action ELECTRICAL    SYSTEM   (CONT) Auxiliary    Heater   Circuits   (Cont) Step   2. Check for continuity between socket and ground. . If    continuity is   indicated, go   to   step    3.    If   no   continuity   is indicated, repair    ground lead    (page 3-2). Step 3. Disconnect lead   422E at   line   disconnect. Check for   +24 VDC at lead 422E. . If   +24 VDC is present, repair lead 422E between line disconnect and heater (page 3-2). If no voltage is present, repair lead 422E between indicator light and line disconnect (page 3-2). 3. AUXILIARY   HEATER   HIGH/LOW   SWITCH    DOES NOT OPERATE. Step   1. Step   2. Step    3. Step 4. Step 5. Disconnect lead   58E from    auxiliary heater high/low switch.    Check    for +24 VDC at lead 58E with auxiliary heater high/low switch closed. . If    +24 VDC is present, go to-   step 2. If no voltage is    present, repair lead 58E (page 3-2). Disconnect lead 58A from auxiliary heater highllow switch. Check for +24 VDC at auxiliary heater high/low switch with auxiliary heater high/low switch closed and in high mode. . If    +24 VDC is present, go to step 3. If no voltage is    present, replace auxiliary heater high/low switch (page 4-190). Disconnect 24 V auxiliary heater high   relay   from    connector. Check for +24 VDC at   connector 30    and    85    with   auxiliary heater on/off    switch   closed and auxiliary heater high/low switch in high mode. l If    +24 VDC is   present, go to step 4. If no voltage is    present, repair lead 422 or lead 58A (page 3-2). Disconnect 24 V auxiliary heater high relay from connector. Check for continuity between connector and ground. . If    continuity is indicated, go to step 5. If no continuity is indicated, repair ground lead (page 3-2). Disconnect 24 V auxiliary heater high relay from connector. Install jumper wires to connectors 30, 85, and 86 to their respective connections at auxiliary heater high relay. Check for +24 VDC at pin 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 6. If no voltage is    present, replace 24 V     auxilialy heater high relay (pages 4-197, 4-198). 3-78