TM 9-2320-273-20
Table 5-14. Miscellaneous Electrical Circuit Troubleshooting (Continued).
INSTRUCTION
INDICATION
YES
NO
REMARKS
2
PERSONNEL HEATER FAN INOPERATIVE.
1
Turn Engine Run
12 volts dc nominal.
Replace
Go to
switch ON and check
switch
Step 3.
for voltage at termin-
(para 5-69).
al B on heater switch,
fig. 5-39 using a
multi meter.
2
If any speed is work-
Detective switch.
Repair.
Replace
ing check wiring
switch
between switch and
(para 5-69).
fan motor.
3
Troubleshoot wiring
(circuits 33 and 34).
Figure 5-39. Heater Fan Circuit
I
3
DOME LAMP INOPERATIVE.
1
Replace the bulb.
Lamp lights.
Go to
Step 2.
2
Using a multimeter
12 volts dc nominal.
Replace
Go to
check for voltage at
switch
Step 3.
dome lamp switch
(para 5-56).
terminals (fig. 5-40).
3
Troubleshoot wiring.
TA 074724
5-61
