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
3. Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
Lights Do Not Operate,
resistance between cab upper
Replace RH turn relay (WP 0009, Fig-
Turn Signals Operate
wiring harness connector P-C11
ure 328) and LH turn relay (WP 0009,
Normally - Continued
(WP 0009, Figure 286) terminal 9
Figure 326).
and machine ground. Resistance
Connect the control indicator harness
should be less than 5.0 ohms.
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 4.
Resistance 5.0 Ohms or Greater -
Proceed to Test Step 9.
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 9. Check for Open Circuit
in Cab Upper Wiring Harness.
1. Disconnect the cab upper wiring
harness connector R-C3 (WP
0009, Figure 91) from cab lower
wiring harness connector P-C42
(WP 0009, Figure 90) (WP 0265).
0023-73