TM 5-3805-292-23
0006
ELECTRICAL TROUBLESHOOTING - SSL HARD TO START IN COLD WEATHER/ EC008 CIRCUIT-TO-
ALTERNATOR EXCITATION, HVAC RELAY, AND OPTION 1 RELAY IS OPEN CONTINUED
Run engine at high idle (TM 5-
3805-292-10).
Measure voltage between charging
Voltage
system protection resistor (WP
between 11.6V
0159), circuit 121B (Y), harness
and 16.4V?
19. Miscellaneous Circuits).
NO
Disconnect circuit 121E (Y), from
alternator (WP 0011).
Disconnect circuit 121B (Y) from
NOTE
charging system protection resistor
There is an inline 20A fuse
and diode in harness between
YES
NO
Check for continuity between
alternator and resistor.
alternator, circuit 121E (Y), harness
present?
side and charging system
protection resistor circuit 121B (Y),
Perform Open Harness Test for circuit 121
Engine, Starting, & Charging
System and Frame 19.
YES
Miscellaneous Circuits).
Replace alternator (WP 0011).
Disconnect charging system
protection resistor (WP 0159).
Measure resistance between
Resistance 50
Replace charging system protection
NO
charging system protection resistor
Ohms?
resistor (WP 0159).
terminals, resistor side (WP 0175,
Frame 19. Miscellaneous Circuits).
YES
Perform Open Harness Test for circuit 137
0006-37
