Section 4 AC Diagnostic Tests
42 Diagnostic Repair Manual
a. Normal excitation winding resistance should be
measured.
10. Connect the meter test leads across stator leads
66 (pin 9) and stator lead 77 (pin 10) at the C1
connector female side.
a. Normal 10 amp battery charge winding
resistance should be measured.
11. Connect the meter test leads across stator lead 11
and frame ground.
a. Infinity should be measured.
12. Connect the meter test leads across stator lead
66A (pin 4) and stator lead 2 (pin 6) at the C1
connector female side and frame ground.
a. Infinity should be measured.
13. Connect the meter test leads across stator lead 2
(pin 6) at the C1 connector female side and frame
ground.
a. Infinity should be measured.
14. Connect the meter test leads across stator lead 66
(pin 9) at the C1 connector female side and frame
ground.
a. Infinity should be measured.
15. Connect the meter test leads across stator leads
wire 11 and stator lead 66A (pin 4) at the C1
connector female side.
a. Infinity should be measured.
16. Connect the meter test leads across stator leads
wire 11 and stator lead 2 (pin 6) at the C1
connector female side.
a. Infinity should be measured.
17. Connect the meter test leads across stator leads
wire 11 and stator lead 66 (pin 9) at the C1
connector female side.
a. Infinity should be measured.
18. Connect the meter test leads across stator lead
66A (pin 4) and stator lead 2 (pin 6) at the C1
connector female side.
a. Infinity should be measured.
19. Connect the meter test leads across stator lead
66A (pin 4) and stator lead 66 (pin 9) at the C1
connector female side.
a. Infinity should be measured.
20. Connect the meter test leads across stator lead 2
(pin 6) and stator lead 66 (pin 9) at the C1
connector female side.
a. Infinity should be measured.
Results
If the stator fails any step replace it. For steps 1-10 keep
in mind resistance values may vary depending on
ambient temperature and calibration of the meter used. If
the stator passes all tests refer back to the flow chart.
Test 10 – Sensing Leads
Procedure
1. Set a DMM to measure resistance.
2. Disconnect connector C1. See Control Panel
Component Identification for connector location.
Figure 4-20. C1 Connector, Male Side
3.
See
Figure 4-20
. Locate the male side of the
connector located on the bottom of the control panel.
a. Connect one meter test lead to pin 1 wire 11S.
It may be helpful to connect a small jumper
lead to the individual pin.
b. Connect the other meter test lead to wire 11S
at terminal block 2 (TB2). See Control Panel
Component Identification for terminal block 2
location.
c. Continuity should be measured.
4.
See
Figure 4-20
. Locate the male side of the
connector located on the bottom of the control panel.
a. Connect one meter test lead to pin 2 wire 44S.
It may be helpful to connect a small jumper
lead to the individual pin.
b. Connect the other meter test lead to wire 44S
at terminal block 2 (TB2).
c. Continuity should be measured.
Winding Wire Numbers
12.5 kW 15 kW 17.5 kW
Power 11 & 22
0.125 Ω
0.0852 Ω
0.067 Ω
Power 44 & 22
0.125 Ω 0.088 Ω 0.067 Ω
Sensing 11S & 44S
0.25 Ω 0.176 Ω 0.134 Ω
Sensing 11S & 22S
0.25 Ω 0.176 Ω 0.134 Ω
Excitation 2 & 6
0.576 Ω 0.824 Ω 0.80 Ω
Battery Charge 66A & 77A
0.132 Ω 0.107 Ω
0.0939 Ω
10A Battery Charge 66 & 77
0.145 Ω 0.124 Ω 0.117 Ω
* Resistance values In ohms at 20 °C. (68 °F.). Actual readings
may vary depending on ambient temperature. A tolerance of
plus or minus 5% is allowed.
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