Taylor-Dunn MB-238-00, Operation, T Roubleshooting And Replacement Parts Manual

Page: 135 / 194

Electrical Troubleshooting
Troubleshooting Page 13
Test 4. KEY FAULT
TEST 4.1:
Turn the key switch ON and place the forward and
reverse switch in the center OFF position
Perform the following tests:
Test the voltage at pin #1 on the 12 pin logic card
connector.
If the voltage equals battery volts, then skip ahead
to Test #5.
Test the voltage on both terminals of the battery voltage
positive circuit breaker.
If the voltage on both terminals equals battery
volts, then skip ahead to test #4.2.
If the voltage on both terminals does not equal
battery volts, then check the circuit breaker and
wiring to the main circuit breaker and to the
batteries for open circuits.
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 4.2:
Test the voltage at the hot terminal (red wire) on the key switch.
If the voltage equals battery volts, then skip ahead to test #4.3.
If the voltage does not equal battery volts, then check the wiring from the key switch to
the battery voltage positive circuit breaker.
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.
Circuit Breaker
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.