Taylor-Dunn B0-248-TT, Operation, T Roubleshooting And Replacement Parts Manual, Page: 114 / 204

Maintenance, Service, and Repair
Electrical Troubleshooting
Page 4
START HERE:
Definitions:
•
“FS-1” = Start switch in the throttle module.
•
“Battery volts” = The voltage of the batteries at the time the test is performed.
•
“Control volts” = Battery Volts (48v system) or 12 Volts (72 volt system).
•
“Pick up” = Energizing a solenoid or contactor.
•
“F/R” = Forward and Reverse.
•
“ISO” = Isolator.
•
“Battery negative” = Main negative battery post.
•
“Battery positive” = Main positive battery post.
•
“Controller” = Speed control module (black box).
•
“HOT terminal” = The side of a switch or contactor that is connect to the power source.
•
“COLD terminal” = The side of a switch or contactor that power is switched to.
•
If, during any test your test light is OFF when it should have been ON, confirm that the test
light is functioning properly before continuing.
• The vehicle may be equipped with solenoids or contactors. In this procedure “contactor”
will be used for both.
After any repairs are made, completely retest the vehicle before
lowering the drive wheels to the ground. Failure to retest the vehicle
could result in unexpected movement of the vehicle resulting in
severe bodily injury and/or property damage.
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.
Disconnect both of the battery leads during any maintenance or
before disconnecting any electrical component or wire. Failure to do
so may cause severe bodily injury and/or property damage.
These test procedures must be performed in the order they were
written. If the test result is good, then proceed to the next test or go
to the next section. Failure to do so may result in incorrect test results.