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 RH turn relay
Proceed to Test Step 13.
Turn Signals Operate
(WP 0009, Figure 328) terminal
Resistance 5.0 Ohms or Greater -
Normally - Continued
87A and 30. Resistance should
Replace RH turn relay (WP 0009, Fig-
be less than 5.0 ohms.
ure 328).
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.
Test Step 13. Check for Open Cir-
cuit 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).
2. Connect jumper wire between RH
turn relay socket (WP 0009, Fig-
ure 329) terminals B1 and A1.
3. Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
resistance between cab upper
Replace cab lower wiring harness
wiring harness connector R-C3
(WP 0266).
(WP 0009, Figure 91) terminal 5
Connect the RH turn relay (WP 0009,
and terminal 10. Resistance
Figure 328) to RH turn relay socket
should be less than 5.0 ohms.
(WP 0009, Figure 329).
Proceed to step 4.
Resistance 5.0 Ohms or Greater -
Replace cab upper wiring harness
(WP 0265).
Connect the RH turn relay (WP 0009,
Figure 328) to RH turn relay socket
(WP 0009, Figure 329).
Proceed to step 4.
4. Turn control indicator switch to
Right and Left Brake Lights Do Not
position SER. DRIVE and Park,
Operate - Repeat troubleshooting
have an assistant apply the ser-
from the beginning.
vice brakes (TM 5-3805-293-10)
Right and Left Brake Lights Oper-
and observe the brake lights from
ate - Troubleshooting complete.
the rear of the machine and verify
both brake lights operate.
0023-76
