Taylor-Dunn B0-T48-48 Taylor Truck T48, Operation Manual

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Electrical Troubleshooting
Section 4 Page 14
TEST 4.3:
Test the voltage at the cold side (violet/black wire) of the key switch.
If the voltage equals battery volts, then skip ahead to test #4.4.
If the voltage does not equal battery volts, then replace the key switch.
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.
TEST 4.4:
Check the wire from the cold side of the key switch to pin #1 on the 12 pin logic card connector for
open circuits.
NOTE: Your vehicle may be equipped with a charger interlock relay. The
charger interlock relay disables the control system when the charger
is connected to its power source. The interlock relay contacts are
in series with the wire from the cold side of the key switch to pin #1
on the 12 pin logic card connector. The relay is located in the charger
cabinet.
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.
STOP
Stop, do not continue. Reaching this point indicates a failure in the Sevcon power unit or
an error was made during testing. Confirm all previous tests were performed correctly
before replacing the Sevcon power unit.
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 injury
or property damage.
This troubleshooting guide is written in sequential order. All tests
must be performed in the order that they are written. Starting in the
middle or skipping sections when not instructed to do so may lead to
invalid test results.