TM 5-3805-262-205-10. WIRING HARNESS MAINTENANCEa. Front Wiring Harness.This task covers testing and repair of front wiringh a r n e s s.TOOLS: No. 1 Common Organizational Maintenance Tool KitCombination box and open end wrench setSocket wrench set, 3/8 inch driveE l e c t r i c a l r e p a i r t o o l k itMultimeterSoldering gun, 25 wattsMATERIALS/PARTS: Clean cloths (Appendix C, item 1)Insulation tape (Appendix C, item 5)Solder (Appendix C, item 16)Electrical cleaner (Appendix C, item 19)Electrical sealer (Appendix C, item 20)NOTEPRELIMINARY PROCEDURE: Battery ground cable disconnected (page 5-148).TESTING (SHEET 1 OF 2)NOTET e s t i n g c o n s i s t s o f s t a r t i n g t h e e n g i n e a n d o p e r a t i n g a l l f r o n t w i r i ngharness circuits as shown in figure FO-3. The wiring harness is okay ifa l l c i r c u i t s f u n c t i o n n o r m a l l y . I f n e c e s s a r y , y o u m a y t e s t i n d i v i d u alw i r e s f o r c o n t i n u i t y b y e n e r g i z i n g t h e c o r r e s p o n d i n g c i r c u i t s h o w n infigure FO-3 and checking for voltage using multimeter or test light. Totest for shorted or grounded wire, you must disconnect both ends of wireunder test as follows.(1) Tag front wiring harness connectors and disconnect as follows:( a)Unplug block-type connectors from ignition switch, blackout lightswiring harness, and cab lower wiring harness by grasping with fingersand pulling firmly.(b)Unplug connectors from vehicle lights switch and hydraulic controlvalve by turning connector nut counterclockwise and pulling firmly.(c)Unplug connectors from instrument cluster pins (page 5-40).(d)Disconnect friction-type spade and bullet terminals by grasping termi-nals with fingers and pulling firmly.( e)Disconnect lug terminals by loosening and removing attaching nuts orscrews.( f )Remove resistors by grasping fuseholder halves with fingers, pushingtogether, twisting counterclockwise, and pulling apart .5-166
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