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ELECTRICAL COMPONENTS
Starter/Generator
2000 FE290 Gasoline Vehicle Maintenance and Service Supplement Page 12-9
12
Armature Ground Test
1. Using a multimeter set on 200
Ω
(ohms), place the positive probe on the commutator bars and the neg-
ative probe on the armature core. The reading should be NO continuity. If the reading is incorrect,
replace the armature and the two bearings (Figure 12-13, Page 12-9).
Visual Inspection of Field Coils
If the insulation on the field coils appears blackened or charred, the serviceability of the coils is questionable.
Burned or scorched coil insulation indicates the starter/generator has overheated due to overloads or
grounded or shorted coil windings. Be sure the insulators are tight in the housing.
Starter/Generator Rework
Any rework must be performed by a qualified technician. Starter/Generator service specifications are listed in
the following table.
• DO NOT SUBMERGE ARMATURE IN SOLVENT.
• BEFORE TESTING, WIPE THE ARMATURE WITH A CLEAN CLOTH AND REMOVE CARBON
DUST AND METAL PARTICLES FROM BETWEEN COMMUTATOR BARS.
Figure 12-13 Armature Ground Test
CAUTION
NOTE
COMMUTATOR
ARMATURE
ARMATURE SHAFT
2m
20
m
200
m
2k
200
200
200
200
20
2
200
m
500
20k
200k
2000
k
Ω
Ω
1000
OFF
WAVETEK
5XL
V
V
V
A
!
!
COM
200mA
MAX
1000 ---
750V
FUSED