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
2. Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
Do Not Operate in Low
for continuity between dimmer
Replace dimmer relay (WP 0009, Fig-
Beam - Continued
relay socket (WP 0009, Figure
ure 296).
297) terminal D11 and terminal
Remove jumper wire between P-C61
E11. Resistance should be less
(WP 0009, Figure 295) terminals 5
than 5 ohms.
and 8.
Connect the front work light wiring
harness connector CL-C18 (WP 0009,
Figure 294) to cab lower wiring har-
ness connector P-C61 (WP 0009, Fig-
ure 295) (WP 0183).
Connect the connector AZ-C1 (WP
0009, Figure 387) to left headlight and
install headlight assembly (WP 0197).
Proceed to step 3.
Resistance 5.0 Ohms or Greater -
Replace cab lower wiring harness
(WP 0266).
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 3.
3. Turn control indicator switch to
Headlight or Headlights Do Not
position SER. DRIVE, dimmer
Operate in Low Beam - Repeat trou-
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 10. Check for Shorted
Cab Lower Wiring Harness.
1. Turn ignition switch and battery
disconnect switch to the OFF
position (TM 5-3805-293-10).
2. Disconnect the cab lower wiring
harness connector P-C3 (WP
0009, Figure 34) from cab upper
wiring harness connector R-C1
(WP 0009, Figure 33) from (WP
0265).
0023-42