Taylor-Dunn SS-025-34 Operation, Maintenance, And Replacement Parts Manual page 118

Curtis PMC Troubleshooting
ISO
Remove the wires and the resistor from the ISO
solenoid and perform the following tests:
Test continuity across the ISO power contacts.
If you do not know how to test for continuity,
refer test to a qualified technician.
•
This should be an open circuit. If it is not
an open circuit then the contactor should
be replaced. 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, other wise continue to the
next test.
Page 24
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.
5. Disconnect the main positive and negative cables at the batteries.
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.