TM 5-2420-230-24-1
Table 3-6. Unit Troubleshooting Table. -- Continued
Malfunction
Test or Inspection
Corrective Action
39.
HOURMETER DOES NOT WORK.
Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry or tools contact positive electrical circuits, a
direct short may result. Damage to equipment and injury or death to personnel may occur.
Step 1.
Check for 24 Vdc at wire 322 on hourmeter (1) (refer to FO-3).
If 24 Vdc is present at wire 322, replace hourmeter (1) (Para 12-23).
If 24 Vdc is not present at wire 322, check wire for continuity. Replace dash harness as necessary
Step 2.
Check alternator exciter relay (2) (signal wire) to ensure it is functioning correctly (refer to FO-1).
If exciter relay (2) is not functioning correctly, replace relay (Para 12-15).
Step 3.
Check for a good ground at hourmeter (1).
If a good ground is not present, replace dash harness (Para 12-39).
Change 1
