TM 5-3805-293-23-2
0022
Table 1. Cab Heating, Air Conditioning, and 12 Volt Power Inverter Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. No Power From 12 Volt
13.
Operate machine until engine
Power Inverter Or +12
reaches normal operating temper-
Volt Auxiliary Port - Con-
ature (TM 5-3805-293-10).
tinued
14.
Turn HVAC blower to maximum
speed (TM 5-3805-293-10).
15. Turn temperature control to the
No Warm Air Exiting From Air Vents
warmest setting and verify warm
- Repeat troubleshooting from begin-
air exiting from air vents.
ning.
Warm Air From Air Vents - 12 volt
power inverter OK, Troubleshooting
complete.
Test Step 3. Test 12 Volt Power
Inverter Battery Supply, Ignition
Supply and Ground Circuit
1. Disconnect cab upper wiring har-
ness connector R-C23 (WP 0009,
Figure 277) from 12 volt power
inverter (WP 0009, Figure 278)
(WP 0265).
2. Turn battery disconnect switch
and ignition switch to the ON posi-
tion (TM 5-3805-293-10).
3. Using digital multimeter, test for
Voltage 18 to 26 Volts - Proceed to
voltage between harness connec-
step 4.
tor R-C23 (WP 0009, Figure 277)
Voltage Less Than 18 Volts - Pro-
terminal 1 and machine ground.
ceed to Test Step 4.
Voltage should be 18 to 26 volts.
4. Using digital multimeter, test for
Voltage 18 to 26 Volts - Proceed to
voltage between harness connec-
step 5.
tor R-C23 (WP 0009, Figure 277)
Voltage Less Than 18 Volts - Pro-
terminal 2 and machine ground.
ceed to Test Step 5.
Voltage should be 18 to 26 volts.
5. Using digital multimeter, test for
Voltage 18 to 26 Volts - Proceed to
voltage between harness connec-
Test Step 7.
tor R-C23 (WP 0009, Figure 277)
Voltage Less Than 18 Volts - Pro-
terminal 1 and terminal 3.
ceed to Test Step 6.
Voltage should be 18 to 26 volts.
Test Step 4. Test 12 Volt Power
Inverter Battery Supply Circuit
1. Turn ignition switch and battery
disconnect switch to the OFF
position (TM 5-3805-293-10).
0022-47
