TM   10-3930-643-20 ELECTRICAL  SYSTEM  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 5-8.   Instrument   Panel   Troubleshooting.   (cont) MALFUNCTION TEST OR INSPECTION CORRECTIVE   ACTION Step   4. Return   M10A   Forklift   to   original   equipment   condition. f . PARKING  BRAKE  LIGHT  DOES  NOT  OPERATE. Step   1.   Remove   socket   and   check   parking   brake   light   bulb. If   the   bulb   is   burned   out,   replace,   refer   to   paragraph   5-25. NOTE Before   performing   continuity   test,    refer   to   paragraph   2-13   for   initial setup   instructions. Step   2. Test   the   continuity   of   the   parking   brake   switch.   Disconnect the   wire   assembly   from   the   switch,   as   shown. Connect   the multimeter   to   the   terminal   on   the   switch   and   ground. If   the   multimeter   needle   does   not   move,   the   switch   does   not   have continuity.   Replace   the   switch,   refer   to   paragraph   5-29. 5-46