Dodge ZB 2005 Service Manual page 263

8F - 18 CHARGING
GENERATOR (Continued)
(6) Remove the upper mounting bolt (Fig. 6).
(7) Remove the lower mounting bolt and nut (Fig.
6).
Fig. 6 MOUNTING BOLTS
1 - Upper Mounting Bolt
2 - Lower Mounting Bolt
(8) Remove generator (Fig. 7).
Fig. 7 GENERATOR REMOVAL/INSTALLATION
INSTALLATION
(1) Install generator.
(2) Install the lower mounting bolt and nut (Fig.
6).
(3) Install the upper mounting bolt (Fig. 6).
(4) Tighten the bolts to 55 N·m (41 ft. lbs).
(5) Connect the battery positive cable to the gener-
ator (Fig. 5), and install the B+ stud cap..
(6) Connect the field connector (Fig. 4).
(7) Install the accessory drive belt (Fig. 3), refer to
the Cooling section for more information.
(8) Install air cleaner assembly, refer to the
Engine/air Intake System for more information.
(9) Connect the negative battery cable, tighten the
nut to 14.2 N·m (125 in. lbs.).
VOLTAGE REGULATOR
DESCRIPTION
The Electronic Voltage Regulator (EVR) is not a
separate component. It is actually a voltage regulat-
ing circuit located within the Powertrain Control
Module (PCM). The EVR is not serviced separately. If
replacement is necessary, the PCM must be replaced.
OPERATION
The amount of DC current produced by the gener-
ator is controlled by EVR circuitry contained within
the PCM. This circuitry is connected in series with
the generators second rotor field terminal and its
ground.
Voltage is regulated by cycling the ground path to
control the strength of the rotor magnetic field. The
EVR circuitry monitors system line voltage at the
PDC and battery temperature. It then determines a
target charging voltage. If sensed battery voltage is
lower than the target voltage, the PCM grounds the
field winding until sensed battery voltage is at the
target voltage. A circuit in the PCM cycles the
ground side of the generator field at 250 times per
second (250Hz), but has the capability to feed the
field control wire 100% of the time (full field) to
achieve the target voltage. If the charging rate can-
not be monitored (limp-in), a duty cycle of 20% is
used by the PCM in order to have some generator
output. Also refer to Charging System Operation for
additional information.
ZB