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
Resistance 5.0 Ohms or Less -
Power Inverter Or +12
continuity between harness con-
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.
Resistance should be less than
Resistance More Than 5.0 Ohms -
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