TM 5-3895-370-14&P
Table 4-4. Unit Troubleshooting Procedures - CONT.
Malfunction
Test or inspection
Corrective action
ELECTRICAL SYSTEM (CONT)
23.
CLEARANCE, MARKER, ID, AND TAILLIGHTS DO NOT OPERATE (24-VOLT
SYSTEM ONLY).
Check continuity across 24-volt cable (connector, terminal E and black or brown wire in
resistor box).
If there is no continuity, replace 24-volt cable.
If there is continuity, refer to fault symptoms #20, 24, and 25.
24.
FRONT AND/OR REAR CLEARANCE AND MARKERLIGHTS DO NOT OPERATE.
NOTE
Start at step 1 for 12-volt system or step 3 for 24-volt system.
Step 1. Check continuity across intervehicular cable (at terminal BK).
If there is no continuity, replace intervehicular cable.
If there is continuity, go to step 2.
Step 2. Check voltage on 12-volt socket/cable (terminal BK) at top of terminal strip (black wire) in junction box.
If 12 ±3 vdc are not measured, replace 12-volt socket/cable (para 4-91).
If 12 ±+3 vdc are measured, go to step 6.
Step 3. Check resistance across clearance/marker diode.
If resistance is not 0.456 - 0.481 ohms, replace diode (para 4-74).
If resistance is 0.456 - 0.481 ohms, go to step 4.
Step 4. Check resistance across clearance/marker resistor.
If resistance is not 3.3 +0.2 ohms, replace resistor (para 4-74).
If resistance is 3.3 +0.2 ohms, go to step 5.
4-30
