Figure 4-9.4 - 2 6 . W i r i n g H a r n e s s e s I n s p e c t i o n , R e p a i r , a n dR e p l a c e m e n t .See f i g u r e 4 - 7 and proceed as follows:a. Inspection.(1) Inspect wiring harness ( 5 9 , f i g . 4 - 7 ) forfrayed insulation. cracked or loose ty-wraps, loosehar-ness clamping, and loose connection to ‘co’mpo-nents and plugs.(2) Inspect wiring harness connectors forloose, bent or missing pins.b. Repair.Tape frayed insulation, replacecra?ked or loose ty-wraps. tighten wiring harnessmounting clamps and tighten all electricalconnections.c.Replacem mt.(1) Removal.Tag and disconnect all electri-cal leads andconnectors from wiring harness ( 5 9 ,f i g . 4 - 7 ) to be removed. Remove all harness clampsand remove wiring harness. If 30% of the harnesswires are defective, the harness must be rebuilt bydirect maintenance level.(2) Installation.Place wiring harness ( 5 9 ,f i g . 4 - 7 ) in position, install all harness clamps.Install red sleeving over each wire terminating atheatingelement ( 6 , f i g . 4 - 7 ) , adjacent to the manualshutter control.Reconnect electrical leads andconnectors.Remove tags.4 - 2 7 . C o n t r o l B o x I n s p e c t i o n , T e s t i n g , a n dR e p l a c e m e n t .See f i g u r e 4 - 7 and proceed as follows:a. Inspection.Proceed as follows:(1) See f i g u r e 4 - 7 and inspect control box(45)for loose mounting, loose connections, andotherevidence of damage.looeeness, damage, andcoolant leaks.(2) See f i g u r e 4 - 9 , and inspect fuseholderassembly, fuse, indicator light assemblies, cir-cuit breaker, and powerswitch for loose mountingand other damage.b. Repair. Hoses and fittings are to be replaced,not-rep=c. Replacement. Replace a hoseassembly orfitt~ng as follows:b. Testing.Test control boxas follows:(1) Removal:(1) Set circuit breaker to close position.(a)Close heater system shutoffcocks.(2) Set switch to ON position.(3) Using multimeter, check resistance acrosspins J49-A andJ49-B. Resistanceshould be approx-(b) Remove hoseaseembly being replaced,(c) If fitting is to be replaced, remove thefitting and plug opening until part is replaced.imately 7 ohms.Removal of fuse, opening of circuitbreaker, or setting switch to OFFposition shouldremove continuity.- If continuity is-notremoved,repair control boxat next higher level of maintenance.(2) Installation. Install hose assembly usingremoval steps in reverse order,4 - 2 0
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