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
Continuity - Replace control indicator
Operate - Continued
for continuity between control
switch (WP 0283).
indicator switch (WP 0009, Figure
Connect the control indicator harness
289) terminal F and machine
connector PE-C11 (WP 0009, Figure
ground. There should be no conti-
287) to cab lower wiring harness con-
nuity.
nector P-C11 (WP 0009, Figure 286)
(WP 0283).
Connect the blackout light harness
connector AAA-C2 (WP 0009, Figure
380) to blackout light (WP 0204).
Proceed to step 3.
No Continuity - Replace control indi-
cator harness (WP 0283).
Connect the blackout light harness
connector AAA-C2 (WP 0009, Figure
380) to blackout light (WP 0204).
Proceed to step 3.
Blackout Lamp Does Not Operate -
3. Turn control indicator switch to
Repeat troubleshooting from the
position B.O. DRIVE (TM 5-3805-
beginning.
293-10) and verify blackout lamp
operates.
Blackout Lamp Operates - Trouble-
shooting complete.
Test Step 10. Check for Shorted
Cab Upper Wiring Harness.
1. Disconnect the blackout light wir-
ing harness connector AAA-C1
(WP 0009, Figure 381) from cab
lower wiring harness connector P-
C14 (WP 0009, Figure 382).
2. Using digital multimeter, measure
Continuity - Replace blackout light
for continuity between blackout
wiring harness (WP 0204).
light wiring harness connector
Connect the control indicator harness
AAA-C1 (WP 0009, Figure 381)
connector PE-C11 (WP 0009, Figure
terminal 1 and machine ground.
287) to cab lower wiring harness con-
There should be no continuity.
nector P-C11 (WP 0009, Figure 286)
(WP 0283).
Proceed to step 3.
No Continuity - Replace cab lower
wiring harness (WP 0266).
Connect the blackout light harness
connector AAA-C2 (WP 0009, Figure
380) to blackout light (WP 0204).
Proceed to step 3.
0023-17
