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Circuit Tests
1. Before testing, check for visible signs of dam-
aged components.
2. Conduct the tests described in Alternator Pin-
to-Pin Tests, Table 10-8.
Test
Meter
Meter (+) Lead
No.
Scale
1
Ohms
Pin C
2
Ohms*
Pin A
3
Ohms
Pin F
4
Ohms
Pin A
5
Diode Test
Pin B
6
Diode Test
Alt. B+ Terminal
7
Diode Test
Pin B
8
Diode Test
Alt. B- Terminal
9
Ohms
Pin D
10
Diode Test
Alt. B+ Terminal
11
Diode Test
Alt. B- Terminal
12
Diode Test
Alt. B- Terminal
13
Diode Test
Pin E
* Applies only when the field coil is attached to the
rectifier/housing assembly.
** If the expected reading is not achieved, check the
thermal switch inside the rectifier/housing assem-
bly and test the switch for continuity.
D10003 07/06
Table 10-8: ALTERNATOR PIN-TO-PIN TESTS
Meter (-) Lead
Connection
Connection
Alt. B- Terminal
Pin F
Alt. B- Terminal
Alt. B- Terminal
Alt. B+ Terminal
Pin B
Alt. B- Terminal
Pin B
Alt. B+ Terminal
Alt. B- Terminal
Alt. B+ Terminal
Pin E
Alt. B- Terminal
Battery Charging Alternator
3. The expected reading listed for each test must
be obtained.
4. Replace any component that fails.
5. Remove wiring harness (1, Figure 10-12)
before any test.
Tested Circuit
Regulator ground circuit
Field coil resistance
Insulated
Insulated
Phase winding and diode <0.7 Volts (flow)**
Phase winding and diode OL (blocking)**
Phase winding and diode OL (blocking)*
Phase winding and diode <0.7 Volts (flow)**
Regulator power circuit
All diodes in parallel
All diodes in parallel
Dual diode trio
Dual diode trio
Expected
Reading
0 ohms
1.5 ± 0.2 ohms
OL (out of limits)
OL (out of limits)
0 ohms
OL (blocking)
<0.8 Volts (flow)
<0.7 Volts (flow)
OL (blocking)
D10-23
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