TM 5-3805-293-23-2
0023
Table 1. Cab Electrical Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. One or Both Headlights
7. Verify that control indicator switch
Do Not Operate in High
is in position SER. DRIVE (TM 5-
Beam - Continued
3805-293-10).
8. Use a digital multimeter, test for
Voltage Between 18 and 26 Volts -
voltage between dimmer relay
Proceed to Test Step 13.
socket (WP 0009, Figure 297) ter-
Voltage Less Than 18 Volts -
minal E12 and machine ground.
Replace headlamp relay (WP 0009,
Voltage should be 18 to 26 volts.
Figure 299).
Install dimmer relay (WP 0009, Figure
296) to dimmer relay socket (WP
0009, Figure 297).
Connect the connector AZ-C1 (WP
0009, Figure 387) to left headlight and
install headlight assembly (WP 0197).
Proceed to step 9.
9. Turn control indicator switch to
Headlight or Headlights Do Not
position SER. DRIVE, dimmer
Operate in High Beam - Repeat trou-
switch to high beam (TM 5-3805-
bleshooting from the beginning.
293-10) and verify headlights
Both Headlights Operate in High
operate in high beam.
Beam - Troubleshooting complete.
Test Step 13. Check for Shorted
Wiring Harness.
1. Turn battery disconnect switch
and ignition switch to the OFF
position (TM 5-3805-293-10).
2. Disconnect the connector AA-C2
(WP 0009, Figure 291) from right
headlight.
3. Disconnect cab lower wiring har-
ness connector P-C4 (WP 0009,
Figure 45) from dash wiring har-
ness connector PF-C1 (WP 0009,
Figure 44) (WP 0276).
4. Using digital multimeter, measure
Continuity - Proceed to Test Step 17.
for continuity between dimmer
No Continuity - Proceed to Test Step
relay socket (WP 0009, Figure
14.
297) terminal C11 and E11. There
should be no continuity.
Test Step 14. Check for Open Wir-
ing Harness.
1. Connect jumper wire between
AA-C2 (WP 0009, Figure 291) ter-
minals 4 and 2.
0023-27