Table 1. Cab Electrical Troubleshooting Procedures - Continued.
TEST OR INSPECTION
3. Blackout Lamp Does not
3. Turn control indicator switch to
Blackout Lamp Does Not Operate -
Operate - Continued
position B.O. DRIVE (TM 5-3805-
Repeat troubleshooting from the
293-10) and verify blackout lamp
Blackout Lamp Operates - Trouble-
N OT E
4. One or Both Headlights
Do Not Operate in High
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 Head-
1. Turn battery disconnect switch to
the ON position (TM 5-3805-293-
2. Turn control indicator switch to
position SER. DRIVE (TM 5-
3. Turn the dimmer switch (TM 5-
3805-293-10) to the high beam
Left Headlight Does Not Operate in
4. Visually check if one headlight
High Beam - Proceed to step 5.
does not operate or both head-
lights do not operate in high
Right Headlight Does Not Operate
in High Beam - Proceed to step 7.
Both Headlights Do Not Operate in
High Beam - Proceed to step 9.
5. Disconnect the connector AZ-C1
(WP 0009, Figure 387) from left
headlight (WP 0197).
Voltage Between 18 and 26 Volts -
voltage between connector AZ-C1
Replace left headlight lamp (WP
(WP 0009, Figure 387) terminal 1
(Gnd) and terminal 2. Voltage
Proceed to step 13.
should be 18 to 26 volts.
Voltage Less Than 18 Volts - Pro-
ceed to Test Step 2.