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Page Title: VOLTAGE TEST
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TM 9-2320-364-20-2      2-1639 NEG (–) TERMINAL MULTIMETER TWO MULTIMETER ONE BATTERY BOX COVER TERMINAL A DUVAC CONTROLLER POS. (+) TERMINAL ”A” GROUP ”B” GROUP NEG. (–) TERMINAL FAN CONTROL SWITCH ENGINE SWITCH POTENTIOMETER ADJUSTING SCREW HEADLIGHT SWITCH (1)   Remove battery box cover. (TM 9-2320-364-10). (2)   Connect multimeter one positive (+) lead to positive (+) terminal on “B” batteries and multimeter one negative (–) lead to negative (–) terminal on group “B” batteries.   (3)   Connect multimeter two positive (+) lead to terminal A of DUVAC controller and multimeter two negative lead to negative (–) terminal of group “A” batteries. (4)   Start engine and turn on headlights and heater.(TM 9-2320-364-10). (5)   Attempt to adjust DUVAC controller until multimeter one reads 14.3-14.6 vdc. (a)   If 14.3-14.6 vdc cannot be obtained, turn off heater, headlights and engine switch and replace DUVAC controller (Para 7-9). (b)   If 14.3-14.6 vdc can be obtained, fault corrected.  Turn off heater, headlights and engine switch. 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. Use caution when turning adjusting screw of potentiometer.  Turning adjusting screw with too much force may damage potentiometer. DUVAC controller resets to the 24 vdc charge mode approximately every 55 seconds.  Make sure multimeter reads 26-30 vdc indicating the system is in the 24 vdc charge mode while reading on multimeter one is taken. Charging voltage is adjusted by turning adjusting screw on potentiometer on DUVAC controller.  Turning to the right increases voltage.  Turning to the left decreases voltage. NOTE

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