WARNING SWITCH CIRCUIT. (Cont) - TM-9-2350-238-20-10219

TM 9-2350-238-20-1

Set MASTER switch OFF. Set INST switch OFF. Place red probe on

Step 9.

engine coolant high-temperature warning switch metal case. Ground black

probe. If multimeter indicates resistance, go to step 10. If multimeter

indicates infinity, clean surface area between engine coolant high-

temperature warning switch and thermostat housing for good metal-to-

metal contact.

Make sure MASTER switch is OFF before repairing

electrical circuits. Failure to observe this warning

could result in injury to personnel.

Step 10. Disconnect lead 509 from engine coolant high-temperature warning switch.

Place red probe in lead 509. Ground black probe. Set MASTER switch

ON. Set INST switch ON. If multimeter indicates about 24 volts, replace

engine coolant high-temperature warning switch. Refer to page 2-626. If

multimeter indicates no voltage, repair lead 509. Refer to page 2-371. Set

MASTER switch OFF. Set INST switch OFF.

2-193