ELECTRICAL SYSTEM
SECTION 10B. FAILURE ANALYSIS
10B-6
PROBLEM PROBABLE CAUSE REMEDY
CAB CIRCUITS (Continued)
4. Cab work lights do not a. Bulb burned out. a. Replace.
work.
b. Faulty wiring or bad electrical b. Test (Section 10C).
ground.
c. Faulty light switch. c. Test (Section 10G).
5. Tail light does not work. a. Bulb burned out. a. Replace.
b. Faulty wiring or bad electrical b. Test (Section 10C).
ground.
c. Faulty light switch. c. Test (Section 10G).
6. Turn signals (both) do not a. Bulb burned out. a. Replace.
work.
b. Faulty flasher. b. Replace.
c. Faulty wiring or bad electrical. c. Test (Section 10C).
ground.
7. One turn signal does not a. Bulb burned out. a. Replace.
work.
b. Faulty flasher. b. Replace.
c. Faulty wiring or bad electrical c. Test (Section 10C).
ground.
8. Cab heater and wipers do a. Ignition switch OFF. a. Turn ON.
not work.
b. Faulty cab relay. b. Test (Section 10H).
c. Faulty wiring or bad electrical c. Test (Section 10C).
ground.
9. Heater fan does not work. a. Ignition switch OFF. a. Turn ON.
b. 20 amp fan circuit breaker tripped. b. Reset/test (Section 10J).
c. Glow plug/light circuit breaker c. Reset/test (Section 10J).
tripped.
d. Faulty cab relay. d. Test (Section 10H).
e. Faulty heater fan switch. e. Test (Section 10C).
f. Faulty heater fan motor. f. Replace.
g. Faulty wiring or bad electrical g. Test (Section 10C).
ground.
10. Wipers do not work. a. Ignition switch OFF. a. Turn ON.
b. 10 amp wiper breaker tripped. b. Reset/test (Section 10J).
c. Glow plug/light circuit breaker c. Reset/test (Section 10J).
tripped.
d. Faulty cab relay. d. Test (Section 10H).
e. Faulty heater fan switch. e. Test (Section 10C).
f. Faulty heater fan motor. f. Replace.
g. Faulty wiring or bad electrical g. Test (Section 10C).
ground.