Taylor-Dunn B0-T48-48 Taylor Truck T48 Operation Manual page 122

Electrical Troubleshooting
Test 7. FORWARD AND REVERSE SWITCH FAULT
Turn the key switch ON, place the forward and reverse switch in the center OFF position and
perform the following tests:
TEST 7.1:
Referencing battery positive, test the voltage on the
center terminal of the F&R switch (Black wire).
If the voltage equals battery volts, then skip ahead
to test #7.2.
If the voltage does not equal battery volts, then
check the wire from the F&R switch to the battery
voltage 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 7.2:
If the vehicle does not travel in reverse, skip
ahead to test #7.3.
Place the forward and reverse switch in the
FORWARD position.
Referencing battery positive, test the voltage at the Blue/
Black wire on the F&R switch.
If the voltage equals battery volts, skip ahead to
test #7.4.
If the voltage does not equal battery volts, then
the F&R switch has failed.
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.
Section 4 Page 20