ELECTRICAL SYSTEM AND TESTING: ELECTRIC
VEHICLES
Test Procedures
22
3.
Check voltage at black/white wire:
3.1. Set a multimeter to 200 volts DC. Place the red (+) probe on the battery no. 1 positive post and place the
black (–) probe on the black/white wire terminal socket in the three-pin connector. The voltage reading
should be 48 to 50 volts (full battery voltage).
3.2. If the reading is zero volts, check the continuity of the black/white wire from the 24-pin connector at the
speed controller to the three-pin connector at the motor speed sensor. If the continuity is correct, replace
the speed controller.
Figure 22-19
Test 13: Speed Sensor Black/White Wire
4.
Check voltage at the red motor speed sensor wire:
4.1. With Tow/Run switch in the RUN position and using a multimeter set to 20 volts DC, place the black (–)
probe on the battery no. 8 negative post and place red (+) probe on red wire terminal socket in three-pin
connector. The voltage reading should be approximately 15-16 volts.
4.2. If the voltage reading is zero volts, check the continuity of the red wire from the 24-pin connector at the
speed controller to the three-pin connector at the motor speed sensor. If the wire continuity is correct,
replace the speed controller.
4.3. If the reading is below 14 volts, replace the speed controller.
4.4. If the voltage reading is correct, proceed to the following step.
Figure 22-20
Test 13: Speed Sensor Red Wire
5.
Check voltage at the light green wire:
2007-2009 Turf 252, Carryall 252 and XRT 900 Maintenance and Service Manual
Page 22-31
