TM 5-3805-262-203-24. ACCESSORIES TROUBLESHOOTING (CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION8. DEFROSTER MOTOR DOES NOT OPERATE (Cont).S t e p 2 . ( C o n t ) .Set DEFROSTER switch to ON position.Check if defroster motor and heater fan operate.a. If both defroster motor and heater fan operate, problem wasmomentary short in circuit. If circuit breaker blows again,problem is in circuit associated with circuit breaker.Disconnect wires from circuit breaker, one at a time to isolateproblem to associated circuit: a u x i l i a r y s t e e r i n g , i n s t r u m e ntpanel cluster (located on left instrument panel), voltmeter, cabrelay solenoid, or electric fuel pump.b. If defroster motor and heater fan do not operate and circuitbreaker did not blow, go to step 3 below.Step 3.Remove engine left side panels (page 9-14).3-170Connect multimeter across terminals of cabb r e a k e r.Multimeter should indicate zero.30 ampere circuita. If multimeter indicates 24 volts, circuit breaker is open. Go tostep 4 below.b. If multimeter indicates zero, replace cab relay (page 5-26).
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