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Location
The Low Voltage/KeyChoice™ Reverse Operating
module is locate on the front side of the dash support,
under the hood (Figure 247).
Figure 247
How It Works
Low Voltage - The low voltage portion of the module is
a voltage comparator, checking the charge voltage
from the engine regulator/rectifier system. If the
charge is less than 11 volts D.C., the low voltage
module senses this and activates the indicator lamp on
the dash which will light until the voltage is over 11
volts D.C.
KeyChoice™ Reverse Operating Module - The
KeyChoice ™ Reverse Operating System Module is
made up of several components, such as diodes and
relays. When it is connected in the circuit, voltage is
applied to certain terminals of the KeyChoice™
Reverse Operating System module from the PTO
switch, reverse switch, and the override switch, which
energizes certain relays in the module. If voltage is not
applied to proper terminals on the KeyChoice™
Reverse Operating System Module, the electric PTO
clutch will stop.
400XT Series Tractor Service Manual
ELECTRICAL SYSTEMS
Testing - Low Voltage Testing
Before replacing the Low Voltage/KeyChoice™
Reverse Operating Module, Check the following:
1.
Test the battery to make sure it is fully charged
and is in good shape.
2.
Next, check the charging system of the engine;
follow the procedure in the appropriate engine
service manual.
3.
If the battery checks out and is in good condition
and the charging system checks out and is
charging properly and the battery light on the dash
is on, replace the module. Without specialized
test equipment, it is not practical to test the
module in the field.
KeyChoice™ Reverse Operating
MVC-843F
System Module
Purpose
The KeyChoice™ Reverse Operating System Module
must be removed from the wiring harness. Using a
multimeter, check the following (Figure 248).
2
4
5
Figure 248
1
3
6
MVC-869F
4 - 15
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