(1) Remove nut, lockwasher and wires
1820 and 1278 from alternator positive
terminal. Discard lockwasher.
(2) Set multimeter select switch to volts
(3) Connect positive (+) multimeter lead to
the positive (+) terminal of the alternator.
(4) Connect negative () multimeter lead
to known good ground.
(5) Start engine and turn on headlights
and heater (TM 9-2320-364-10).
(a) If at least 26 vdc are not present,
turn off heater, headlights and
engine and go to Step 4 of this
(b) If at least 26 vdc are present, turn
off heater, headlights and engine.
Repair wire 1278 (see schematic
Fig 2-39) or notify DS
(6) Install wires 1278 and 1820 on
alternator positive (+) terminal with
lockwasher and nut.
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.
Alternator is capable of producing over 40 vdc. Be careful when taking a voltage reading not to get shocked.
DUVAC controller resets to the 24 vdc
charge mode approximately every 55
seconds. Take the voltage reading for at
least a minute to make sure voltage
reading is taken during the 24 vdc charge
Tag and mark all wires prior to removal.