TM 9-2320-364-20-2      2-1629 NEG (–) TERMINAL DUVAC COVER WASHER LOCK– WASHER SCREW MULTIMETER TWO MULTIMETER ONE BATTERY BOX COVER TERMINAL A DUVAC CONTROLLER POS. (+) TERMINAL ”A” GROUP ”B” GROUP HEADLIGHT SWITCH FAN CONTROL SWITCH ENGINE SWITCH (1)   Remove battery box cover (TM 9-2320-364-10).   (2)   Set multimeter select switch to volts dc. (3)   Connect multimeter one positive (+) lead to positive (+) terminal and multimeter one negative (–) lead to negative (–) terminal on group ”A” batteries.   (4)   Remove four screws, lockwashers, washers and DUVAC cover.   Discard lockwashers. (5)   Set multimeter select switch to volts dc. (6)   Connect multimeter two positive (+) lead to terminal A of DUVAC controller and multimeter two negative (–) lead to negative (–) terminal of group ”A” batteries. (7)   Start engine and turn on headlights and heater. (8)   Observe voltage indicated on multimeter one. (a)   If 13.8 - 14.2 vdc are not present, adjust voltage regulator (Para 7-7). (b)   If 13.8 - 14.2 vdc are present, voltage regulator adjustment is OK. (9)   Turn off heater, headlights and engine switch. (10)   Install DUVAC cover with four screws, lockwashers and washers. (11)   Install battery box cover. VOLTAGE TEST Remove all jewelry such as rings, dog tags, bracelets, etc.  If jewelry or tools contact positive electrical circuits, a direct short may result.  Damage to equipment, injury or death to personnel may occur. Terminal 1 and terminal 2 at DUVAC controller are electrically hot all of the time.  Ensure DUVAC cover does not contact either terminal.  Damage to equipment, injury or death to personnel may occur. NOTE DUVAC controller resets to the 24 vdc charge mode approximately every 55 seconds.  Make sure multimeter two reads 13-15 vdc indicating the system is in the 12 vdc charge mode while reading on multimeter one is taken.