Table 1. Cab Electrical Troubleshooting Procedures - Continued.
TEST OR INSPECTION
5. One or Both Headlights
3. Turn control indicator switch to
Headlight or Headlights Do Not
Do Not Operate in Low
position SER. DRIVE, dimmer
Operate in Low Beam - Repeat trou-
Beam - Continued
switch to low beam (TM 5-3805-
bleshooting from the beginning.
293-10) and verify headlights
Both Headlights Operate in Low
operate in low beam.
Beam - Troubleshooting complete.
N OT E
6. Front Left Turn Signal
Does Not Operate
Always inspect the harness connectorsthat are involved in the circuit.
Poor connections can often be the cause of a problem in an electrical
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 Faulty Front
Left Turn Signal Bulb Assembly.
1. Turn control indicator switch to
position SER. DRIVE (TM 5-
2. Turn the turn signal switch (TM 5-
3805-293-10) to the left turn sig-
3. Disconnect the connector AZ-C3
(WP 0009, Figure 389) from left
turn signal (WP 0197).
4. Turn battery disconnect switch
and ignition switch to the ON posi-
tion (TM 5-3805-293-10).
Voltage Pulsing and Peaks
voltage between connector AZ-C3
Between 18 and 26 Volts - Replace
(WP 0009, Figure 389) terminal 1
front left signal bulb assembly (WP
and terminal 2. Voltage should be
pulsing 18 to 26 volts.
Proceed to step 6.
Voltage Less Than 18 Volts - Pro-
ceed to Test Step 2.
6. Turn control indicator switch to
Front Left Turn Signal Does Not
position SER. DRIVE, turn signal
Operate - Repeat troubleshooting
switch (TM 5-3805-293-10) to the
from the beginning.
left turn signal position and verify
Front Left Turn Signal Operates -
front left turn signal operates.