TM-9-2320-362-14&P HMMWV Technical Manual Electrical Environmental System (EES) Download
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TM 9-2320-362-14&P Table 3-2. Unit Troubleshooting (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 3. HOURMETER IS NOT FUNCTIONING Step 1. Start engine (TM 9-2320-280-10) and let engine come to normal idle speed of 650 RPM (± 25 RPM). Step 2. Check hourmeter after 6 minutes. If hourmeter advances 1/10 of an hour, procedure is completed. If hourmeter fails to advance 1/10 of an hour, go to step 3. Step 3. Remove tach/hourmeter box cover. Check hourmeter leads for tight connections. Tighten leads as necessary. Replace tach/hourmeter box cover and repeat Step 2. If hourmeter fails to advance 1/10 of an hour, replace hourmeter (para 3-19). END OF TESTING 4. WITH PARKING BRAKE NOT SET, PARKING BRAKE DASH LIGHT IS OFF, AND STATUS INDICATOR ALARM AND LIGHT DO NOT COME ON (REFER TO FIGURES 3-1 THRU 3- 3) NOTE ● When measuring voltage, measure against ground. ● When measuring +28 VDC, use ± 2 VDC for tolerance. Step 1. Disconnect cable W64 from connector 12J1 on tach/ hourmeter box. Step 2. Using multimeter, measure voltage at connector 12J1, pin "G", on tach/hourmeter If multimeter displays If multimeter does NOT step 5. box. - about +28 VDC, go to step 3. display about +28 VDC, go to 3-13