Taylor-Dunn B0-012-10 Operation, T Roubleshooting And Replacement Parts Manual page 131

Solenoids
If the vehicle runs in forward only then skip ahead to the test sequence:
Forward (does not run in reverse).
If the vehicle runs in reverse only then skip ahead to the test sequence:
Reverse (does not run in forward).
Connect a voltmeter across the ISO solenoid COLD terminal
and battery negative.
Close all interlock switches and turn the Key Switch
ON.
Depress the accelerator pedal fully.
•
If the voltage is at battery volts then the wire
from the ISO solenoid to the PMC is bad. 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 ISO solenoid HOT terminal
and battery negative.
Close all interlock switches and turn the Key Switch
ON.
Depress the accelerator pedal fully.
•
If the voltage is at battery volts then the ISO solenoid
has failed. 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.
•
If the voltage is not at battery volts then check the
wiring to battery positive and the main 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.
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.
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.
Curtis PMC Troubleshooting
The voltage shown is for illustration
only. The actual voltage may vary.
FLUKE 79
SERIES II MULTIMETER
Solenoids are shown for reference only.
The type of solenoid in your truck may
OFF
V
look different
Hz
V
mV
A
+
_
Battery Negative
The voltage shown is for illustration
only. The actual voltage may vary.
FLUKE 79
SERIES II MULTIMETER
Solenoids are shown for reference only.
The type of solenoid in your truck may
OFF
V
look different
Hz
V
mV
A
+
_
Battery Negative
ISO
FWD/REV
ISO
FWD/REV
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