TM 5-3805-293-23-2
0023
Table 1. Cab Electrical Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
12. Front and Rear Turn Sig- 2.
Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
nals Do Not Operate in
for resistance between cab lower
Replace 24V flasher module (WP
Either Right or Left Posi-
wiring harness connector P-C47
0267).
tion, Brake Lights Oper-
(WP 0009, Figure 330) terminal 2
Proceed to step 3.
ate Normally - Continued
and machine ground. Resistance
Resistance 5.0 Ohms or Greater -
should be less than 5.0 ohms.
Replace cab lower wiring harness
(WP 0266).
Proceed to step 3.
3. Turn control indicator switch to
Right and Left Turn Signals Do Not
position SER. DRIVE, turn signal
Operate - Repeat troubleshooting
switch (TM 5-3805-293-10) to the
from the beginning.
right turn signal position and verify
Right and Left Turn Signals Oper-
right turn signal operates, then to
ate - Troubleshooting complete.
the left turn signal position and
verify left turn signal operates.
N OT E
13. One or Both Brake
Lights Do Not Operate,
Always inspect the harness connectorsthat are involved in the circuit.
Turn Signals Operate
Poor connections can often be the cause of a problem in an electrical
Normally
circuit. Verify that all connections in the circuit are clean and secure,
and that all connections are in good condition. If a problem with a con-
nection is found, correct the problem and verify that this diagnostic code
is Active before performing this procedure.
Perform open or short circuit test ateach harness connection to identify
correct harness to replace.
Perform this test only if condition is active.
Test Step 1. Check for Power to
Flasher Module.
1. Turn battery disconnect switch to
the ON position (TM 5-3805-293-
10).
2. Turn control indicator switch to
position SER. DRIVE (TM 5-
3805-293-10).
3. Turn the turn signal switch (TM 5-
3805-293-10) to the OFF position.
Both Brake Lights Do Not Operate -
4. Have an assistant apply the ser-
Proceed to Test Step 2.
vice brakes (TM 5-3805-293-10)
and observe the brake lights from
Only the Right Brake Light Oper-
the rear of the machine.
ates - Proceed to Test Step 10.
Only the Left Brake Light Operates
- Proceed to Test Step 12.
0023-68
