TM 5-3805-293-23-2
0023
Table 1. Cab Electrical Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. Blackout Lamp Does not
2. Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
Operate - Continued
resistance between blackout light
Replace cab lower wiring harness
wiring harness connector AAA-C1
(WP 0266).
(WP 0009, Figure 381) terminal 1
Remove jumper wire between AAA-
and machine ground. Resistance
C2 (WP 0009, Figure 380) terminals 1
should be less than 5.0 ohms.
and machine ground.
Connect the blackout light harness
connector AAA-C2 (WP 0009, Figure
380) to blackout light (WP 0204).
Proceed to step 3.
Resistance 5.0 Ohms or Greater -
Replace blackout light wiring harness
(WP 0204).
Connect the control indicator harness
connector PE-C11 (WP 0009, Figure
287) to cab lower wiring harness con-
nector P-C11 (WP 0009, Figure 286)
(WP 0283).
Proceed to step 3.
3. Turn control indicator switch to
Blackout Lamp Does Not Operate -
position B.O. DRIVE (TM 5-3805-
Repeat troubleshooting from the
293-10) and verify blackout lamp
beginning.
operates.
Blackout Lamp Operates - Trouble-
shooting complete.
Test Step 8. Check for Shorted
Control Indicator Wiring Harness.
1. Remove jumper wire between
AAA-C2 (WP 0009, Figure 380)
terminals 1 and machine ground.
2. Using digital multimeter, measure Continuity - Proceed to Test Step 9.
for continuity between control
No Continuity - Proceed to Test Step
indicator harness connector PE-
10.
C11 (WP 0009, Figure 287) termi-
nal 1 and machine ground. There
should be no continuity.
Test Step 9. Check for Shorted
Control Indicator Switch.
1. Disconnect the control indicator
harness connector PE-C10 (WP
0009, Figure 288) from control
indicator switch (WP 0009, Figure
289).
0023-16
