ENGINE COOLANT TEMPERATURE INDICATOR CIRCUIT. (Cont)

TM 9-2350-238-20-1

Make sure MASTER switch is OFF before repairing

electrical circuits. Failure to observe this warning

could result in injury to personnel.

Disconnect instrument (gage) panel wiring harness. Place red probe on

Step 2.

pin F (lead 27) of receptacle. Ground black probe. Set MASTER and

INST switches ON. If multimeter indicates no voltage, repair lead 27 from

INST switch to receptacle. Refer to page 2-371. If multimeter indicates

about 24 volts, repair lead 27 from plug to instruments. Refer to page

2-371. Set MASTER and INST switches OFF. Connect wiring harness.

Start engine and run at 1000 to 1200 rpm for 15 minutes or until engine

Step 3.

reaches operating temperature. Stop engine. Disconnect lead 33 from

ENGINE WATER (COOLANT) TEMP indicator. Place red probe in lead

33. Ground black probe. If multimeter indicates between 900 and 1000

ohms, replace ENGINE WATER (COOLANT) TEMP indicator. Refer to

page 2-571. If multimeter indicates less than 900 ohms or more than 1000

ohms, go to step 4. Connect lead 33 to ENGINE WATER (COOLANT)

TEMP indicator.

2-155