TM 9-2320-260-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
33. TACHOGRAPH LAMPS FAIL TO OPERATE
Check tachograph for power input.
Step 1. Set multimeter to a range that will measure 24 volts.
Step 2. Disconnect leads 27 and 40 connectors.
Step 3. Start engine (TM 9-2320-260-10).
Step 4. Touch positive lead of multimeter to contact end of lead 27.
Step 5. Touch negative lead of multimeter to frame ground.
Step 6. Touch positive lead of multimeter to contact end of lead 40. Voltage should be present.
Step 7. Touch negative lead of multimeter to frame ground. Voltage should be present.
a. If voltage is present at both leads tested, go to step 8.
b. If voltage is not present, go to malfunction 29, test 2.
Step 8. Install lead 27 and 40.
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