E3-46 Statex III Electrical Checkout Procedure 2/02 E03012
8.8 Ground Fault Checks
If a ground fault occurs during operation, the Electrical System Fault light will turn On and the amount
of leakage to ground will be displayed on the MONITOR ANALOG INPUT CHANNELS screen of the
PTU. To isolate a ground fault problem, the following procedures should be followed:
1. Visually inspect the truck for obvious causes of the fault:
a. Remove the rear wheel covers and inspect wheel motor armature commutators for evidence
of flashover. Inspect brushes for length and damage. Inspect field coils for evidence of mois-
ture, oil or other contaminants which may accumulate in the armature cavity. If flashover is
severe or field coils are damaged by contaminants, the wheel motor should be removed for
repair. If moisture is present, it may be possible to dry the wheel motor without removal.
b. Remove inspection covers on main alternator to inspect slip rings, brushes and check for
moisture or other contamination.
c. Inspect cables for damaged insulation.
d. Inspect exposed connections for possible short circuit to nearby metallic objects.
e. Inspect retarding grids for damage and dirt accumulation.
2. If no physical evidence of the ground fault can be found during the above inspection, refer to the
appropriate GE “Vehicle Test Instructions for OHV Statex III Systems” publication for proce-
dures required to perform a megger test on the power circuit, alternator field and control. This
publication provides specific procedures to be followed to prevent damage to system compo-
nents and additional information to help isolate the ground fault.
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