19. Trouble Shooting the Drive Circuit
Testing the Potentiometer and Drive Switch circuit.
The potentiometer, drive switch and forward switch circuit can be tested all together from the 14
pin harness connector at the I-Drive controller (traction drive models only).
•.Remove the rear panel of the machine.
•Locate the I-Drive controller (silver box)
•Disconnect the 14 pin electrical connector on the I-Drive
•Use an ohm meter (analog for best results) and measure the resistance between the
black/orange and black/white wires. It should be approximately 5K (4.7) ohms.
If not see “Testing the Potentiometer”.
•Test the resistance between the black/pink and black/orange wires. Turn the shaft of the
potentiometer while measuring. The forward and reverse switch will need to be in the forward or
reverse position (test in both positions). Activate the drive lever. The resistance should vary from
5K to Inf. The resistance should change smoothly, If not see “Testing the Potentiometer”.
Testing the Potentiometer
•Disconnect the potentiometer from the circuit.
•With a ohm meter, measure the resistance across the black/orange wire and the black/white
wire. The resistance should be 5K (about 4.7 K ohms). If not replace potentiometer.
•Test the resistance between the black/pink and the black/white wire. (Use an analog meter for
best results) Turn the shaft of the potentiometer while measuring. The resistance should vary
from 5K to Inf. The resistance should change smoothly, if not replace the potentiometer.
•Test the resistance between the black/pink and the black/orange wire the wire. Turn the shaft of
the potentiometer while measuring. The resistance should vary from 5K to 0 (zero). The
resistance should change smoothly, if not replace the potentiometer.
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