ELECTRICAL TROUBLESHOOTING
SECTION 4 Main Sequence PAGE 13
Key Switch
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.
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 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
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 property damage and/or serious bodily
injury.
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.
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