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
3. Using digital multimeter, measure
Continuity - Replace cab lower wiring
Do Not Operate in Low
for continuity between dimmer
harness (WP 0266).
Beam - Continued
relay socket (WP 0009, Figure
Install dimmer relay (WP 0009, Figure
297) terminal C12 and terminal
296) to dimmer relay socket (WP
E11. There should be no continu-
0009, Figure 297).
ity.
Connect the connector AZ-C1 (WP
0009, Figure 387) to left headlight and
install headlight assembly (WP 0197).
Proceed to step 4.
No Continuity - Proceed to Test Step
11.
4. 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 11. Check for Open Cir-
cuit In Cab Lower Wiring Harness.
1. Connect jumper wire between
dimmer relay socket (WP 0009,
Figure 297) terminals C12 and
E11.
2. Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
for resistance between cab lower
Proceed to Test Step 12.
wiring harness connector P-C3
Resistance 5.0 Ohms or Greater -
(WP 0009, Figure 34) terminal 42
Replace cab lower wiring harness
and terminal 16. Resistance
(WP 0266).
should be less than 5 ohms.
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.
0023-43
