TM 5-3805-262-20TESTINGNOTET e s t i n g c o n s i s t s o f o p e r a t i n g c a b u p p e r w i r i n g h a r n e s s a c c e s s o r y c i r-cuits as shown in figure FO-3. The wiring harness is okay if accessoriesoperate normally. If necessary, you may test individual wires for conti-nuity by energizing the corresponding accessory circuit shown in figureF O - 3 a n d c h e c k i n g f o r v o l t a g e u s i n g m u l t i m e t e r o r t e s t l i g h t . T o t e stf o r s h o r t e d o r g r o u n d e d w i r e , y o u m u s t d i s c o n n e c t b o t h e n d s o f w i reunder test as follows.(1)( 2)( 3)(4)(5)(6)(7)( 8)(9)At cab switch panel, tag and disconnect cab upper wiring harness termi-nals (page 10-48).At top of cab, at defroster fans, tag and disconnect cab upper wiringharness terminals (page 10-62).Disconnect cab upper wiring harness terminal from dome light (page10-68).Tag and disconnect cab upper wiring harness terminals from defogger (page10-52).At cab wall, grasp cab console wiring harness connector with fingers, pryopen tabs at top and bottom of connector, and firmly pull connector fromcab upper wiring harness connector.If necessary for repair, squeeze tabs at sides of cab upper wiring har-ness connector and push connector from cab wall.Connect multimeter between ends of wire under test and check multimeterf o r c o n t i n u i t y i n d i c a t i o n.If multimeter does not indicate continuity,repair wire or connector.Connect multimeter between either end of wire under test and good vehicleground. Check multimeter for no continuity (open circuit) indication. Ifmultimeter indicates continuity, repair chafed or cut wire insulation.Identify harness wires adjacent to wire under test. Connect multimeterbetween either end of wire under test and each adjacent wire. Check mul-t i m e t e r f o r n o c o n t i n u i t y ( o p e n c i r c u i t ) i n d i c a t i o n f o r e a c h t e s t . Ifmultimeter indicates continuity, repair chafed or cut wire insulation.5-183
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