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 control indica-
Replace control indicator harness
tor switch (WP 0009, Figure 289)
(WP 0283).
terminal F and D. Resistance
Connect the blackout light harness
should be less than 5.0 ohms.
connector AAA-C2 (WP 0009, Figure
380) to blackout light (WP 0204).
Proceed to step 3.
Resistance 5.0 Ohms or Greater -
Replace control indicator switch (WP
0283).
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).
Connect the blackout light harness
connector AAA-C2 (WP 0009, Figure
380) to blackout light (WP 0204).
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 6. Check for Open Circuit
In Cab Lower or Blackout Light Wir-
ing Harness.
1. Connect jumper wire between
AAA-C2 (WP 0009, Figure 380)
terminals 1 and machine ground.
2. Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
resistance between cab lower wir-
Proceed to Test Step 8.
ing harness connector P-C11 (WP
Resistance 5.0 Ohms or Greater -
0009, Figure 286) terminal 5 and
Proceed to Test Step 7.
machine ground. Resistance
should be less than 5.0 ohms.
Test Step 7. Check for Open Circuit
In Blackout Light 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).
0023-15
