TM 5-3805-262-203-24. ACCESSORIES TROUBLESHOOTING (CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION2. WINDSHIELD WIPER MOTOR DOES NOT OPERATE (Cont).S t e p 4 . ( C o n t ).b. If multimeter indicates 24 volts, a short circuit to grounde x i s t s i n c a b e l e c t r i c a l c i r c u i t . I s o l a t e d e f e c t i v e c i r c u i t b yreconnecting wire from cab relay BAT. terminal to long, silverterminal of cab circuit breaker. Then, at cab switch panel, dis-connect and tape wires connected to each of the three circuitbreakers one at a time and check if remaining circuit(s) operatewhen associated switch is operated. If circuit is okay, problemis in circuit associated with breaker from which wire was dis-connected.Step 5.Press 3 ampere circuit breaker on cab switch panel.Check if windshield wiper operates.a. If windshield wiper operates, problem was momentary short inc i r c u i t . 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 incircuit. Isolate by checking wiring for worn insulation. Ifwiring okay, perform resistance check of wiper motor. Replaceparts as necessary (page 10-13).b. If windshield wiper does not operate, go to step 6 below.Step 6. 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 FRONTWIPER switch terminals.Connect multimeter between FRONTWIPER switch B terminal andc h a s s i s .Turn ignition key switch to onp o s i t i o n.Multimeter shall indicate 24 volts.a. If 24 volts not obtained, replace 3 ampere circuit breaker (page10-18).3-161
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