TM   10-3930-643-20 ELECTRICAL  SYSTEM  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 5-8. Instrument   Panel   Troubleshooting.   (cont) MALFUNCTION TEST OR INSPECTION CORRECTIVE   ACTION t . REAR WORK LIGHTS SWITCH DOES NOT OPERATE. Refer   to   paragraph   5-7,   Light   System   Troubleshooting. u. FRONT WORK LIGHTS SWITCH DOES NOT OPERATE. Refer   to   paragraph   5-7,   Light   System   Troubleshooting. v. ETHER START SWITCH DOES NOT OPERATE. NOTE Before   proceeding   with   continuity   tests,   refer   to   paragraph   2-13   for i n i t i a l    s e t u p    i n s t r u c t i o n s. Step   1. Test   the   continuity   of   the   ether   start   switch.   Turn   switch   to ON   position. Connect   multimeter   to   terminals   at   the   back   of switch. If   the   multimeter   needle   does   not   move,   the   circuit   does   not   have continuity.   Replace   ether   start   switch,   refer   to   paragraph   5-20. 5-72