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
Resistance 5.0 Ohms or Less -
Power Inverter Or +12
Replace cab upper wiring harness
Volt Auxiliary Port - Con-
nector P-C3 (WP 0009, Figure 34)
(WP 0265).
tinued
terminal 16 and machine ground.
Proceed to step 4.
5.0 ohms.
Verify cab ground is clean and tight
(WP 0009, Figure 65). If cab ground is
OK, 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).
6. 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 7. Test 12 Volt Accessory
Power and Ground
1. Turn ignition switch and battery
disconnect switch to the OFF
position (TM 5-3805-293-10).
2. Connect cab upper wiring har-
ness connector R-C23 (WP 0009,
Figure 277) to 12 volt power
inverter (WP 0009, Figure 278)
(WP 0265).
3. Disconnect cab upper wiring har-
ness connector A-C8 (WP 0009,
Figure 276) from +12 volt auxiliary
port (WP 0009, Figure 275) (WP
0275).
4. Turn battery disconnect switch
and ignition switch to the ON posi-
tion (TM 5-3805-293-10).
0022-50