TM 9-2320-363-20-1 Table   3-1. Troubleshooting (Cont) Malfunction Test   or   Inspection Corrective  Action ELECTRICAL   SYSTEM   (CONT) Dome Light Circuits 1. NEITHER DOME LIGHT OPERATES. Step 1. Check    dome/auxiliary/flasher lights    15A   fuse. . If   defective, replace 15A   fuse    (page    4-204). Step    2. Disconnect lead   420J    from   dome/auxiliary/flasher 15A   fuse. Check for +12 VDC at   lead    420J. . If   +12    VDC is   present, repair    lead   41 (page 3-2). If no voltage is present, go to step 3. Step    3. Disconnect connector   from   vehicular light   switch.    Check for   +12    VDC at pin J. . If    +12 VDC is   present, repair    lead   420J (page 3-2). If   no voltage    is   present, replace vehicular light   switch   (page    4-170). 2. ONE DOME LIGHT OPERATES, THE    OTHER DOES NOT IN    EITHER MODE. Step 1. Inspect    light   bulb. . Replace if   broken    or   defective (page    4-227). Step    2. Disconnect lead   41 from defective dome light.   Check for   continuity   from dome light   ground    lead   to   ground. . If    continuity   is   indicated, go   to   step   3.    If   no   continuity   is indicated,    repair    ground lead    (page    3-2). 3-45