Figure 11-11. Testing Stator Coils
11-16. TESTING STATOR COILS FOR GROUND. The stator coils are insulated form the core. A break in
the installation, allowing the bare wire to touch the core, will ground the coil and result in no output.
To test the stator for a ground (end shields separated), lift the stator away from the end shield and place
wooden blocks approximately .50 inch thick between the stator and the shield to keep them separated.
Using a 110-volt test lamp, place one test probe on the core and the other test probe to one of the rectifier
leads, making certain to have good electrical connections at both test probes. The lamp should not light. If the
lamp lights, it is an indication that the coil windings are grounded to the core and a replacement of the stator is
required.
11-17. TESTING ALT E R N ATOR CAPA C I TORS. Capacitors are used in connection with alternators to
suppress any transient peak voltage that may occur. It is essential, therefore to test the capacitor when servicing
the alternator.
This is especially true where diode rectifiers test open or short circuited.
The capacitor is connected to the inner end of the alternator “BAT” terminal screw and to the inner surface
of the rectifier end shield (Ground).
Connect the capacitor tester to the alternator “BAT” terminal screw and the disconnected ground lead.
CAUTION
Do not allow the tester probes or clips to touch the end shield or the rectifier
leads while the test is in progress or damage to the rectifiers may occur.
The specified capacity for the alternators (capacitor part of terminal screw) is .5 ± .1 MFD (min.). Replace
capacitors with low capacity, shorted or with high series resistance.
Revised: 2/13/89
2H3
CHEROKEE ARROW III SERVICE MANUAL
ELECTRICAL SYSTEM
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