TM 10-3930-641-20
ELECTRICAL SYSTEMS TROUBLESHOOTING (CONT)
PROBLEM NO. 1 (CONT)
(Sheet 3 of 6)
NOTE 1: When testing for voltage, negative lead from your multimeter should be to ground (machine frame). See page 2-56.
NOTE 2: An assistant is required to turn and hold POWER switch in the START position.
NOTE 3: Start engine to ensure that repair/replacement has solved problem.
ANSWER
STEP
QUESTION OR INSTRUCTION
YES
NO
REMARKS
1
Turn main disconnect switch to ON. Turn POWER switch to
See page 2-305.
START. Test for voltage present (NOTES 1 and 2) at terminal
3
2
BAT terminal where R/T wire connects to POWER switch. Is
battery voltage present?
2
Replace/repair R/T wire from POWER switch to main power
Use same gage and color wire removed.
relay.
3
Turn main disconnect switch to ON. Turn POWER switch to
See page 2-70.
START. Test for voltage present (NOTES 1 and 2) at terminal S
5
4
where W wire connects to POWER switch. Is battery voltage
present?
Turn main disconnect switch to OFF. Replace POWER
See page 2-305.
4
--
--
switch (NOTE 3).
5
Turn main disconnect switch to ON. Turn POWER switch to
See page 2-70.
START. Test for voltage present at terminal on starter relay (7,
7
6
page 2-70) where W wire connects. Is battery voltage present?
6
Replace/repair W wire from starter relay to POWER switch.
Use same gage and color wire removed.
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--
Go on to Sheet 4
Change 2
2-76
