TM 5-3805-293-23-2
0023
Table 1. Cab Electrical Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
N OT E
13. One or Both Brake
Lights Do Not Operate,
The control indicator switch is a mechanical switch. Ensure that switch
Turn Signals Operate
levers are centered during this test. Adjust switch levers to achieve the
Normally - Continued
lowest possible resistance reading.
3. Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
resistance between control indica-
Replace control indicator harness
tor switch (WP 0009, Figure 289)
(WP 0283).
terminal C and K. Resistance
Proceed to step 4.
should be less than 5.0 ohms.
Resistance More Than 5.0 Ohms -
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).
Proceed to step 4.
4. Turn control indicator switch to
Right and Left Brake Lights Do Not
position SER. DRIVE, have an
Operate - Repeat troubleshooting
assistant apply the service brakes
from the beginning.
(TM 5-3905-293-10) and observe
Right and Left Brake Lights Oper-
the brake lights from the rear of
ate - Troubleshooting complete.
the machine and verify both brake
lights operate.
Test Step 6. Check for Open Cab
Lower Wiring Harness or Brake
Switch.
While an assistant applies the brake,
Resistance Less Than 5.0 Ohms -
using digital multimeter, measure
Proceed to Test Step 8.
resistance between cab lower wiring
Resistance 5.0 Ohms or Greater -
harness connector P-C11 (WP 0009,
Proceed to Test Step 7.
Figure 286) terminal 2 and 10. Resis-
tance should be less than 5.0 ohms.
Test Step 7. Check for Faulty Brake
Switch.
1. Disconnect the cab lower wiring
harness connector P-C83 (WP
0009, Figure 332) from brake light
switch (WP 0009, Figure 333).
0023-71
