Taylor-Dunn B 50, Operation, T Roubleshooting And Replacement Parts Manual

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Curtis PMC Troubleshooting
Page 11
Key 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.
Test all interlock switches and/or interlock relays (if equipped) for continuity. Depending on the model of
your vehicle, it may have a seat interlock, Foot interlock, Charger interlock, special order interlock or any
combination of the above. Refer to the wire diagram at the end of this section for location of the interlocks.
NOTE: Due to the many different configurations possible for special order interlocks,
they will not be included in this text. Refer to the option list for your truck or
contact your Taylor-Dunn
® Representative for more information.
If you do not know how to test for continuity, refer test to a qualified technician.
"COLD, Violet Wire(s)"
"HOT, Red wire(s)"
BATTERY MAIN NEGATIVE
KEY SWITCH
View of the terminals of a
typical Key Switch
A
OFF
mV
V
V
Hz
FLUKE 79 SERIES II MULTIMETER
Connect a voltmeter across the HOT terminal of the key
switch and battery negative.
•
If the voltage is not at battery volts then check the
wire between the key switch and battery positive.
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.
"COLD, Violet Wires(s)"
"HOT, Red wire(s)"
BATTERY MAIN NEGATIVE
KEY SWITCH
View of the terminals of a
typical Key Switch
A
OFF
mV
V
V
Hz
FLUKE 79 SERIES II MULTIMETER
Connect a voltmeter across the COLD terminal of the key
switch and battery negative.
Turn the key switch ON.
•
If the voltage is not at battery volts then the key switch
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 at battery volts but the previous test
at pin #4 in the Accelerator section failed then check
the wire from the key switch to pin #4 at the
accelerator module. 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.