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
Continuity - Replace control switch
Do Not Operate in Low
for continuity between control
panel harness (WP 0275).
Beam - Continued
switch panel wiring harness con-
Install dimmer relay (WP 0009, Figure
nector A-C1 (WP 0009, Figure 31)
296) to dimmer relay socket (WP
terminal 23 and terminal 9. There
0009, Figure 297).
should be no continuity.
Connect the connector AZ-C1 (WP
0009, Figure 387) to left headlight and
install headlight assembly (WP 0197).
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).
Proceed to step 3.
No Continuity - Replace cab upper
wiring harness (WP 0265).
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).
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).
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 14. Check for Open Cir-
cuit In Control Switch Panel Wiring
Harness.
1. Disconnect the control switch
panel wiring harness connector A-
C1 (WP 0009, Figure 31) from
cab upper wiring harness connec-
tor R-C2 (WP 0009, Figure 32)
(WP 0275).
0023-45
