Curtis PMC Troubleshooting
Page 13
F/R switch
1. Make sure the key-switch is in the “OFF” position, then remove the key.
2. Place the forward-reverse switch in the center “OFF” position.
3. Set the park brake.
4. Place blocks under the front wheels to prevent vehicle movement.
The rear drive wheels may rotate during some of the following tests. Block the
front wheels, raise the rear drive wheels off the ground, and support the vehicle
with jack stands. Failure to do so may cause the vehicle to move and cause
severe bodily injury and/or property damage.
Rotating rear drive wheels are a potential hazard. Keep hands, arms, legs and
loose clothing away from the rear drive wheels while conducting tests. Failure
to do so may cause serious bodily injury.
Connect a voltmeter across the Solenoid Negative Buss Bar
and battery positive.
NOTE: You may skip this test if it was completed in a
previous section
•
If the voltage is not at battery volts then check the
wiring to battery negative and the negative circuit
breaker. Stop trouble shooting here and repair the
problem. When the repair is completed, completely
retest the vehicle before lowering the drive wheels
to the ground.
Connect a voltmeter across the center terminal of the forward
and reverse side of the F&R switch and battery negative.
Close all interlock switches, turn the Key Switch ON,
and place the F&R Switch in Forward.
Depress the accelerator pedal fully.
•
If the voltage is not at battery volts then go to the
Accelerator
sequence.
ISO
FWD/REV
Solenoids are shown for reference only.
The type of solenoid in your truck may
look different
Main Battery
Positive
The voltage shown is for illustration
only. The actual voltage may vary.
A
OFF
FLUKE 79
-
+
SERIES II MULTIMETER
Hz
V
mV
V
The CENTER terminal is the
Green/Black wire
Battery Negative
A
OFF
mV
V
V
Hz
FLUKE 79
SERIES II MULTIMETER
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