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
3. Using digital multimeter, test for
Voltage 18 to 26 Volts - Replace cab
Power Inverter Or +12
voltage between harness connec-
upper wiring harness (WP 0265).
Volt Auxiliary Port - Con-
tor P-C3 (WP 0009, Figure 34)
Proceed to step 4.
tinued
terminal 18 and machine ground.
Voltage Less Than 18 Volts -
Voltage should be 18 to 26 volts.
Replace cab lower wiring harness
(WP 0266).
Connect cab upper wiring harness
connector R-C23 (WP 0009, Figure
277) to 12 volt power inverter (WP
0009, Figure 278) (WP 0265).
Proceed to step 4.
4. Operate machine until engine
reaches normal operating temper-
ature (TM 5-3805-293-10).
5. Turn HVAC blower to maximum
speed (TM 5-3805-293-10).
No Warm Air Exiting From Air Vents
6. Turn temperature control to the
- Repeat troubleshooting from begin-
warmest setting and verify warm
air exiting from air vents.
ning.
Warm Air From Air Vents - 12 volt
power inverter OK, Troubleshooting
complete.
Test Step 6. Test 12 Volt Power
Inverter Ground Circuit
1. Turn ignition switch and battery
disconnect switch to the OFF
position (TM 5-3805-293-10).
2. Disconnect cab lower wiring har-
ness connector P-C3 (WP 0009,
Figure 34) from cab upper wiring
harness connector R-C1 (WP
0009, Figure 33) (WP 0265).
0022-49
