12
SECTION 55 -- ELECTRICAL SYSTEM -- CHAPTER 4
603.54.471.00 -- 11 -- 2004
14
ROTOR AND REGULATOR FIELD CIRCUIT
TEST
The following testing devices are required:
¯ 12 volt battery
¯ multitester
¯ 2 watt test lamp.
See figure 14.
1. Disconnect all alternator wires.
2. Connect a 12 V. battery and a 2.2 watt test lamp
(2) in series to D+ (1) and alternator casing
(negative side of the casing).
3. The test lamp should light up.
If the test lamp does not light up, then the rotor
circuit is faulty. Check brushes, contact rings and
rotor field winding continuity.
If the test shows these components are satisfacto-
ry, then the regulator may be faulty.
26652
15
CHECKING THE CONTINUITY OF THREE
STATOR WINDINGS
Position the points of an ohmmeter (regulated on Ω
x1 scale) so that they touch the stator phase ends
(a -- b -- c) in the three possible ways shown in
figures 15, 16 and 17. Each reading should show a
certain resistance value which should be the same
for all three readings.
If resistance shows infinity or zero, the measured
phase is either interrupted or short--circuited and
the stator needs to be changed.
26653
Ω
16
26654
Ω
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