TM   10-3930-643-20 ELECTRICAL  SYSTEM  TROUBLESHOOTING  AND  MAINTENANCE. 5-7. Light   System   Troubleshooting. MALFUNCTION TEST OR INSPECTION CORRECTIVE   ACTION a. FRONT  WORK  LIGHT(S)  DOES  NOT  OPERATE. Step   6. Test   the   light   switch   for   continuity. Disconnect    instrument panel   harness   from   light   switch,   as   shown.   Turn   light   switch to   ON   position. Connect   the   multimeter   to   Pin   M   and   to   ground. If   the   multimeter   needle   does   not   move,   the   circuit   does   not   have continuity.   Replace   light   switch,   refer   to   paragraph   5-27. Step   7. Return   M10A   Forklift   to   original   equipment   condition. b . HEADLIGHT(S)  DOES  NOT  OPERATE. Step  1. Check   the   bulb. If   the   headlight   bulb   is   burned   out,   replace,   refer   to   paragraph 5-34. Before   proceeding   with   continuity   test,   refer i n i t i a l    s e t u p    i n s t r u c t i o n s. to   paragraph   2-13.   for 5-27