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
5. Using digital multimeter, test for
Voltage 10 to 14 Volts - Proceed to
Power Inverter Or +12
voltage between harness connec-
step 6.
Volt Auxiliary Port - Con-
tor A-C8 (WP 0009, Figure 276)
Voltage Less Than 10 Volts - Pro-
tinued
terminal 1 and machine ground.
ceed to step 7.
Voltage should be 10 to 14 volts.
6. Using digital multimeter, test for
Voltage 10 to 14 Volts - Replace +12
voltage between harness connec-
volt auxiliary port (WP 0275).
tor A-C8 (WP 0009, Figure 276)
Proceed to step 14.
terminal 1 and terminal 2.
Voltage Less Than 10 Volts - Pro-
Voltage should be 10 to 14 volts.
ceed to step 7.
7. Turn ignition switch and battery
disconnect switch to the OFF
position (TM 5-3805-293-10).
8. Disconnect harness connector R-
C2 (WP 0009, Figure 32) from
harness connector A-C1 (WP
0009, Figure 31) (WP 0265).
9. Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
continuity between harness con-
ceed to step 10.
nector A-C1 (WP 0009, Figure 31)
Resistance More Than 5.0 Ohms -
terminal 12 and harness connec-
Replace cab upper wiring harness to
tor A-C8 (WP 0009, Figure 276)
+12 volt auxiliary port (WP 0265).
terminal 1.
Proceed to step 14.
Resistance should be less than
5.0 ohms.
10. Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
continuity between harness con-
ceed to step 11.
nector A-C1 (WP 0009, Figure 31)
Resistance More Than 5.0 Ohms -
terminal 13 and harness connec-
Replace cab upper wiring harness to
tor A-C8 (WP 0009, Figure 276)
+12 volt auxiliary port (WP 0265).
terminal 2.
Proceed to step 14.
Resistance should be less than
5.0 ohms.
11. Disconnect cab upper wiring har-
ness connector R-C23 (WP 0009,
Figure 277) from 12 volt power
inverter (WP 0009, Figure 278)
(WP 0265).
12. Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
continuity between harness con-
ceed to step 13.
nector R-C23 (WP 0009, Figure
Resistance More Than 5.0 Ohms -
277) terminal 4 and harness con-
Replace cab upper wiring harness to
nector R-C2 (WP 0009, Figure
+12 volt auxiliary port (WP 0265).
32) terminal 12.
Proceed to step 14.
Resistance should be less than
5.0 ohms.
0022-51
