TM 5-3805-293-23-2
0023
Table 1. Cab Electrical Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
13. One or Both Brake
2. Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
Lights Do Not Operate,
resistance between cab upper
Replace cab lower wiring harness
Turn Signals Operate
wiring harness connector R-C3
(WP 0266).
Normally - Continued
(WP 0009, Figure 91) terminal 10
Proceed to step 3.
and machine ground. Resistance
Resistance 5.0 Ohms or Greater -
should be less than 5.0 ohms.
Replace cab upper wiring harness
(WP 0265).
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 control indicator harness
connector PE-C10 (WP 0009, Figure
288) to control indicator switch (WP
0009, Figure 289).
Proceed to step 3.
3. 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 10. Check for Faulty LH
Turn Relay.
1. Turn battery disconnect switch to
the OFF position.
2. Disconnect the LH turn relay (WP
0009, Figure 326) from LH turn
relay socket (WP 0009, Figure
327).
3. Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
resistance between LH turn relay
Proceed to Test Step 11.
(WP 0009, Figure 326) terminal
Resistance 5.0 Ohms or Greater -
87A and 30. Resistance should
Replace LH turn relay (WP 0009, Fig-
be less than 5.0 ohms.
ure 326).
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 5-3805-293-10) 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.
0023-74
