Taylor-Dunn TT-316-36 Operation, T Roubleshooting And Replacement Parts Manual page 109

TEST 6.2:
Accelerator pedal released.
Test the voltage from pin #9 to pin #8.
If the voltage equals battery volts, then skip ahead
to test #6.3.
If the voltage does not equal battery volts, then
check the wire from pin #8 to 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 6.3:
Accelerator pedal released.
Test the voltage from pin #8 to pin #4.
If the voltage equals battery volts, then skip ahead
to test #6.4.
If the voltage does not equal battery volts, then
check the wire from pin #4 to the battery voltage
negative 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.
TEST 6.4:
Accelerator pedal released.
Test the voltage from pin #9 to pin #1.
If the voltage is below 0.3 volts, then skip ahead
to test #6.5.
If the voltage is above 0.3 volts, then the module
has failed and must 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.
Electrical Troubleshooting
Sevcon Troubleshooting
Page 13