17-30 ELECTRICAL SYSTEM
Alternator
Stator Coil Inspection
•
Connect the hand tester (× 1 Ω range) between the coil
wires and read the tester.
Special Tool - Hand Tester: 57001-1394
If the tester does not read as specified, replace the alter-
nator frame.
Stator Coil Resistance: 0.2 Ω or less
•
Using the highest hand tester range, measure the resis-
tance between the stator coil core and each of the coil
windings.
If there is any reading at all, the stator coil winding has a
short and the alternator housing must be replaced.
Rotor Coil Inspection
•
Connect the hand tester (× 1 Ω range) between the slip
rings [A] and read the tester.
Special Tool - Hand Tester: 57001-1394
If the tester does not read as specified, replace the rotor
[B].
Rotor Coil Resistance: 2.8 ∼ 3.0 Ω
•
Using the highest tester range, measure the resistance
between the rotor shaft and each of the slip rings.
If there is any reading at all, the rotor coil has a short and
must be replaced.
Slip Ring Cleaning
•
Visually inspect the slip ring for dirt or pitting.
If necessary, smooth the slip ring with No. 300 ∼ No. 500
emery cloth.
Slip Ring Diameter
•
Measure the diameter of the slip rings.
If the measurement is less than the service limit, replace
the rotor [A].
Slip Ring Diameter
Standard: 14.4 mm (0.57 in.)
Service Limit: 14.0 mm (0.55 in.)
Carbon Brush Length
•
Measure the length [A] that both carbon brushes that stick
out of the holder.
If either one is worn down to less than the service limit,
replace it.
Carbon Brush Length (Projected Portion)
Standard: 10.5 mm (0.41 in.)
Service Limit: 8.4 mm (0.33 in.)
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