TM 5-3805-262-203-24. ACCESSORIES TROUBLESHOOTING (CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION9. BOTH REAR DEFOGGER FANS DO NOT OPERATE (Cont).S t e p 4 . ( C o n t ) .b . ( C o n t ).I f c i r c u i t i s o k a y , p r o b l e m i s i n c i r c u i t a s s o c i a t e d w i thbreaker from which wire was disconnected.Step 5.Turn DEFROSTER switch on cab switch panel to ON position.Check if defroster motor operates.a. If defroster motor operates, check light green wire between 6ampere circuit breaker and rear defogger fans for open circuit.Repair or replace wiring (page 5-184).b. If defroster motor operates, go to step 6 below.Step 6. Press 6 ampere circuit breaker just below DEFROSTER switch on cabswitch panel.Check if defroster motor and defogger fans operate.a. If defroster motor and defogger fans operate, problem wasmomentary short in circuit.b . I f c i r c u i t b r e a k e r b l o w s , a s h o r t t o g r o u n d e x i s t s i n c i r c u i t.Go to step 7 below.c. If defroster motor and defogger fans both do not operate,problem is in 6 ampere circuit breaker. Replace it (page 10-58).d. If defroster motor operates, but defogger fans do not, checklight green wire between 6 ampere circuit breaker and defoggerfans for open circuit. Replace as necessary.Step 7.Turn ignition key switch to offp o s i t i o n.Remove HEAT CONTROL knob fromcab switch panel by pullings t r a i g h t u p o f f c o n t r o l s h a f t.Remove four screws securing cabswitch panel.Carefully pull cab switch panelupwards from heater console justenough to gain access to 6 am-p e r e c i r c u i t b r e a k e r t e r m i n a l s.Disconnect light green wirespade terminal from 6 amperecircuit breaker terminal by grasping with your fingers and firmlypulling from circuit breaker terminal.3-175
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