AERATION DETECTOR CIRCUIT. (Cont) - TM-9-2350-238-20-10228

TM 9-2350-238-20-1

2-12. ELECTRICAL CIRCUIT TROUBLESHOOTING (CONT).

Drain coolant from radiators to lower coolant below the safe level. Set

Step 2.

MASTER switch ON. If low engine coolant level warning light operates, go

to step 3. If low engine coolant level warning light fails to operate, replace

aeration detector unit. Refer to page 2-539. Set MASTER switch OFF. Fill

radiators with coolant.

Make sure MASTER switch is OFF before repairing electrical

circuits. Failure to observe this warning could result in injury to

personnel.

Disconnect electrical lead from low engine coolant level warning light.

Step 3.

Place red probe on pin A. Ground black probe. Set MASTER switch ON.

If multimeter indicates about 24 volts, go to step 4. If multimeter indicates

no voltage, repair lead 509A. Refer to page 2-371. Set MASTER switch

OFF.

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