Taylor-Dunn B0-248-TT, Operation, T Roubleshooting And Replacement Parts Manual, Page: 119 / 204

Maintenance, Service, and Repair
Electrical Troubleshooting
Page 9
Throttle Module (using analyser):
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.
With the power switch OFF, connect a throttle module to the analyzer.
Position the power switch to the 6-11 volt range.
All but the power lamp should be OFF. If the FS-1, FS-3 or OV
lamp (Over Voltage) are ON, then the module is faulty.
Depress the lever on the module. The FS-1 lamp should
be ON with no more that a few degrees of rotation. If the
FS-1 lamp does not come on, then the module is faulty
(see note2 below).
The voltage on the digital display should vary with the
position of the module arm, starting at approximately 6-
volts and ending at approximately 11-volts.
If the module is equipped with the FS-3 switch, the FS-3
lamp should come ON when the module arm is rotated to
the full speed position. If the lamp does not come ON then
the module is faulty.
Note1: Current versions of the throttle module do not have the
additional switched output (FS-3 fully depressed). The
additional switched output was only used on PT-II control
systems and Power-Tron 240, 350, or 480 systems that were
equipped with the Power Plus module.
If the OV lamp comes ON at any time, then the module is faulty.
If the Low battery lamp is ON, then the analyzer battery should
be replaced.
Additional information regarding the analyzer can be found in the
instructions provided with the analyzer (D0-110-53)
If the module functions correctly with the analyzer but not on the vehicle it is likely
that there is a fault in the vehicle wiring.
NOTE2: Failures of the FS-1 circuit indicate a possible vehicle wiring fault that has resulted in
a short circuit across FS-1. BEFORE REPLACING THE MODULE: Confirm that there
are no shorts in the vehicle wiring or components. Installing a replacement module in
a vehicle with faulty wiring will burn out the new module.