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FIGURE 10-12. WIRING HARNESS PLUG JUMPER
WIRE CONNECTION
1. Wiring Harness Plug
D10-24
2. Regulator
Battery Charging Alternator
FIELD COIL TESTS
This test is used to check for an open or shorted field
coil.
Field Coil Test 1: Check for Open or Shorted Field
Coil
1. Set the digital multimeter DMM to x1 scale.
Ensure the DMM is zeroed.
2. Connect the meter leads from pin A (F-, Figure
10-13) and pin F (F+) in the regulator harness
plug. The DMM must show 1.2 ± 0.2 ohms.
a. If the meter shows more than 1.5 ohms, the
field coil is open.
b. If the meter shows less than 0.5 ohm, the
field coil is shortened. Replace the field coil.
FIGURE 10-13. PIN CONNECTION
IDENTIFICATION
Field Coil Test 2: Check For Grounded Field Coil
1. Set the digital multimeter (DMM) to x10K scale.
Ensure the DMM is zeroed.
2. Connect one meter lead to pin A (F-, Figure 10-
14) in the regulator harness plug. Connect the
other lead to the alternator ground (B-) terminal.
The DMM must show a very high resistance. If
the DMM reads less than 100K ohms, the field
coil is grounded. Replace the field coil.
D10003 07/06
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