COOLANT HEATER CONTROL BOX LIGHT CIRCUIT. (Cont)

TM 9-2350-238-20-1

2-12. ELECTRICAL CIRCUIT TROUBLESHOOTING (CONT).

Make sure MASTER switch is OFF before repairing

electrical circuits. Failure to observe this warning

could result in injury to personnel.

Step 2.

To access coolant heater circuit breaker, remove right C02 cylinder access

cover. Refer to page 2-923. Disconnect battery power lead from 20A

circuit breaker. Place red probe in battery power lead. Ground black probe.

If multimeter indicates about 24 volts, go to step 3. If multimeter indicates

no voltage, repair battery power lead. Refer to page 2-371. If problem still

exists, troubleshoot battery power circuit. Refer to page 2-82. Connect

lead.

Disconnect lead 400 from 20A circuit breaker. Connect multimeter to 20A

Step 3.

circuit breaker receptacles. If multimeter indicates 0 ohms, go to step 4. If

multimeter indicates infinity, replace 20A circuit breaker. Refer to page

2-1029. Connect leads.

2-326