TM 10-3930-641-20
ELECTRICAL SYSTEMS TROUBLESHOOTING (CONT)
PROBLEM NO. 1 (CONT)
(Sheet 4 of 6)
ANSWER
STEP
QUESTION OR INSTRUCTION
YES
NO
REMARKS
7
Turn main disconnect switch to OFF. Turn POWER switch to
See page 2-70.
OFF. Disconnect B/W wire from starter relay and start interlock
9
8
relay (10, page 2-70). Test B/W wire for continuity. Is there
continuity?
8
Replace/repair B/W wire from starter relay to start interlock.
--
--
Use same gage and color wire removed.
9
Turn main disconnect switch to ON. Test start interlock relay
See page 2-70.
(10, page 2-70) terminal (from which B/W wire was removed)
11
10
for continuity to ground. Reconnect B/W wire. Is there
continuity?
10
Replace/repair B wire from start interlock to ground.
--
--
Use same gage and color wire removed.
11
Turn POWER switch to ON. Test for voltage present at terminal
See page 2-70
on start interlock relay (10, page 2-70) where LT BL wire
12
13
connects. Is battery voltage present?
12
Replace/repair LT BL wire from start interlock to alternator.
--
--
Use same gage and color wire removed.
13
Place a jumper between B/W wire and ground and attempt to
14
15
crank engine. Does engine crank?
14
Replace start interlock relay (10, page 2-70). Turn POWER
If problem still exists, replace/repair BK ground wire from
switch to OFF.
start interlock relay terminal 4 to connector at warning horn
relay (8, page 2-70) mounting screw.
--
--
Go on to Sheet 5
Change 2
2-77
