ELECTRICAL 5 - 12
November 2007 GEM Service Manual
DRIVE AND POWER SYSTEM TROUBLESHOOTING CHARTS
The Drive and Power System Troubleshooting Chart A should be used as a guide to isolate electrical problems
with the batteries, master disconnect switch, main contactor, and motor controller that are not covered by the
fault codes. Drive and Power System Troubleshooting Chart B should be used to as a guide to isolate
problems with the motor, motor magnets, tachometer, and LCD. For problems with the lights, horn, heater, light
bar, power outlet, radio, or wiper, refer to the Accessory System Troubleshooting Chart.
Drive and Power System Troubleshooting Chart A
Note: All DC voltage measurements should be taken with respect to motor controller B-
(72 VDC) or chassis ground (12 VDC).
Step Action Yes No
1 Prior to turning the key switch to the ON position,
verify the following:
• Vehicle battery charger is not connected to AC
power
• Master disconnect switch is turned on
• Accelerator pedal is not depressed
Are all conditions met?
Proceed to Step 2. Make the necessary
correction, and try
operating the vehicle
again.
2 Turn the key to the ON position. Apply the foot brake,
release the parking brake, depress and release the
accelerator pedal. Did you hear a clunk sound from
the contactor under the dash?
Proceed to Step 3. Proceed to Step 4,
3 Are any error codes displayed on the LCD? Stop and use the
DRIVE SYSTEM
ERROR CODES to
isolate the vehicle fault.
Proceed to Step 4.
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