TM 5-3805-293-23-2
0023
Table 1. Cab Electrical Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. One or Both Headlights
5. 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.
Test Step 4. Check for Faulty Dim-
mer Relay.
1. Turn ignition switch and battery
disconnect switch to the OFF
position (TM 5-3805-293-10).
2. Disconnect the front work light
wiring harness connector CL-C18
(WP 0009, Figure 294) from cab
lower wiring harness connector P-
C61 (WP 0009, Figure 295) (WP
0183).
3. Turn battery disconnect switch
and ignition switch to the ON posi-
tion (TM 5-3805-293-10).
4. Using digital multimeter, test for
Voltage Between 18 and 26 Volts -
voltage between cab lower wiring
Dimmer relay is operating.
harness connector P-C61 (WP
Proceed to Test Step 5.
0009, Figure 295) terminal 5 and
Voltage Less Than 18 Volts - Pro-
terminal 8 (Gnd). Voltage should
ceed to step 5.
be 18 to 26 volts.
5. Turn ignition switch and battery
disconnect switch to the OFF
position (TM 5-3805-293-10).
6. Remove dimmer relay (WP 0009,
Figure 296) from dimmer relay
socket (WP 0009, Figure 297).
7. Turn battery disconnect switch
and ignition switch to the ON posi-
tion (TM 5-3805-293-10).
8. Using digital multimeter, test for
Voltage Between 18 and 26 Volts -
voltage between dimmer relay
Relay has power at the coil.
socket (WP 0009, Figure 297) ter-
Proceed to Test Step 8.
minal C12 and terminal E11
Voltage Less Than 18 Volts - Relay
(Gnd). Voltage should be 18 to 26
has no power at coil. Proceed to Test
volts.
Step 10.
0023-37
