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PANEL LIGHTS WILL NOT LIGHT. cont'd -680640266
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TM-5-2420-224-20-1 Tractor Wheeled 4x4 DED Small Emplacement Excavator (SEE) and High Mobility Material Handler (HMMH) Manual
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TACHOMETER SHOWS NO INDICATION. cont'd
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
39. TACHOMETER SHOWS NO INDICATION.
NOTE
If STE/ICE-R Cl Engine GO-NO GO Chain does not diagnose cause of problem,
return to this troubleshooting table.
Refer to wiring diagram (page 3-138) for all wiring repair steps.
Step 1. Perform STE/ICE-R Cl Engine GO-NO GO Chain test procedures in the DCA
diagnostic mode.
If malfunction is found, refer to List of Tasks (page iii) or
Alphabetical Index (page Index-1) and repair or replace
damaged or faulty components.
If malfunction is not found, go to step 2.
Step 2. Loosen two captive screws (1) and pull bracket (2) out enough to gain
access to area behind bracket.
Step 3. Remove two clamps (3) and pipe assembly (4).
NOTE
For steps 4 thru 6, engine must be running.
Step 4. Check for +24 VDC between wire 31S (5) and ground at tachometer (6).
If +24 VDC is present, go to step 6.
If +24 VDC is not present, go to step 5.
Step 5. Disconnect connector D (7) and check for +24 VDC between wire 31S (5)
and ground.
If +24 VDC is not present, repair wiring 31S between
connector D and alternator.
If +24 VDC is present, repair wiring 31S between tachometer
and connector D.
Step 6. Check for +24 VDC between wire 36 (8) and ground at tachometer (6).
If +24 VDC is present, replace tachometer (page 4-128).
If +24 VDC is not present, repair wiring 36 between tachometer
and fuse box 1.
3-137

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