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TM 10-3930-669-20
1. ENGINE FAILS TO CRANK (CONT).
KNOWN INFO
TEST OPTIONS
Shunt to starter cable OK.
Starter ground cable OK.
Starter OK.
Batteries OK.
Battery to shunt cable OK.
Wire 2 OK.
Relay R5 ground wire OK.
Wire 7 OK.
Wire 23 OK.
Relay R5 OK.
Voltage test.
STE/ICE-R #89.
POSSIBLE PROBLEMS
REASON FOR QUESTION
Engine switch faulty.
Wire 33 faulty.
Wire 32 faulty.
Relay R3 faulty.
Main power switch faulty.
Fuse 1 faulty.
Wire 4 faulty.
This question eliminates a
possible problem or group of
possible problems
determining
where troubleshooting
continues.
KNOWN INFO
TEST OPTIONS
Shunt to starter cable OK.
Starter ground cable OK.
Starter OK.
Batteries OK.
Battery to shunt cable OK.
Wire 2 OK.
Relay R5 ground wire OK.
Wire 7 OK.
Wire 23 OK.
Relay R5 OK.
Main power switch OK.
Fuse 1 OK.
Wire 4 OK.
Continuity test.
STE/ICE-R #91.
POSSIBLE PROBLEMS
REASON FOR QUESTION
Engine switch faulty.
Wire 33 faulty.
Wire 32 faulty.
Relay R3 faulty.
If continuity is not present,
engine switch is faulty.
2-28
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