TM 10-3930-641-20
ELECTRICAL SYSTEMS TROUBLESHOOTING (CONT)
PROBLEM NO. 5
(Sheet 1 of 4)
COLD WEATHER
DOES NOT WORK
STARTING AID
Engine cold (see NOTE). POWER switch ON or START.
NOTE
COOLANT TEMPERATURE MUST BE BELOW 80F (26.7C) TO CLOSE SWITCH!
The starting aid circuit receives its power from fuse 8. When the START AID switch is closed current flows from the fuse, through the switch,
through the solenoid, through the deactivating switch and to ground. The deactivating switch must be closed. This switch opens (see NOTE above)
when coolant temperature is above 100 F (37.8 C), deactivating the starting aid circuit. The diode protects the START AID switch from arcing due