TM   10-3930-643-20 ELECTRICAL  SYSTEM  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 5-8. Instrument   Panel   Troubleshooting.   (cont) MALFUNCTION TEST OR INSPECTION CORRECTIVE   ACTION ENGINE WATER TEMPERATURE WARNING LIGHT DOES NOT OPERATE. Step   1. Remove   socket   and   check   engine   coolant   temperature   warning light   bulb. If   the   bulb   is   burned   out,   replace,   refer   to   paragraph   5-25. NOTE Before   proceeding   with   continuity   test,   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   2. Test   the   continuity   of   the   engine   water   temperature   switch. Disconnect   the   harness   assembly   from   the   switch,   as   shown. Connect   multimeter   to   the   terminals   on   the   switch. If   the   multimeter   needle   does   not   move,   the   switch   does   not   have continuity.   Replace   the   switch,   refer   to   paragraph   5-39. 5-48