TM-9-2320-279-20-1

M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)

TECHNICAL MANUAL; MAINTENANCE INSTRUCTIONS; ORGANIZATIONAL MAINTENANCE, VOLUME 1 OF 3

TM-9-2320-279-20-1 - Page 324 of 985

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cont)

Table 2-9. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

TANKER SYSTEM (CONT)

5. AUXILIARY PUMP WILL NOT PUMP FUEL (CONT).

NOTE

Refer to FO-1, Sheet 4, for M978 Electric Diagram.

Step 2. Remove control junction box cover (para 7-49). Check resistance across APC AUXILIARY

PUMP CONTROL switch terminals when switch is set to ON.

If there is more than zero ohms resistance, replace APC AUXILIARY PUMP

CONTROL switch (para 7-48).

Step 3. Connect batteries (para 7-91). Check for 24 to 30 vdc to APC AUXILIARY PUMP CONTROL

switch. Touch positive (+) probe to terminal with single red wire and negative (-) probe to

vehicle.

If there is 24 to 30 vdc, go to Step 6.

If no voltage, go to Step 4.

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