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. While an assistant applies the
Resistance Less Than 5.0 Ohms -
Lights Do Not Operate,
brake, using digital multimeter,
Replace cab lower wiring harness
Turn Signals Operate
measure resistance between
(WP 0266).
Normally - Continued
brake light switch (WP 0009, Fig-
Proceed to step 3.
ure 332 terminal A and C. Resis-
Resistance 5.0 Ohms or Greater -
tance should be less than
Replace brake switch (WP 0291).
5.0 ohms.
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 8. Check for Open Circuit
from Cab Lower Wiring Harness to
Cab Upper Wiring Harness.
1. Disconnect the RH turn relay (WP
0009, Figure 328) from RH turn
relay socket (WP 0009, Figure
329).
2. Connect jumper wire between RH
turn relay socket (WP 0009, Fig-
ure 329) terminals A2 and A1.
0023-72