TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download

TM 9-2815-220-34 Section XXVI. REPAIR OF ELECTRICAL SYSTEM WIRING HARNESS ASSEMBLY NOTE Model A VDS-l 790-2DR engine is not equipped with an engine wiring haess. 3-149. General The electrical system wiring harness assembly is made up of two major circuits, the engine circuit anti transmission circuit. The engine circuit in- cludes leads for the starter, starter low voltage protection relay, generator, generator blower motor(2D only), manifold heater system, engine oil pressure and oil temperature transmitte1·s, fuel solenoids, fuel/water sepa1·ator automatic drain and the hour meter. The transmission circuit in- cludes leads for the neutral shift switch and oil pressure and oil temperature transmitters and manjf old healer solenoid. 3-150. Disconnect Points a. The val'ious electrical components are inter- connected by wiring harnesses and leads which terminate at rPmovable plug-in connectors and couplings. The cables leads and haesses are fas- tened to the engine and transmission by means of cable clamps which are secured to tapped pads, brackets and clip assemblies. b. Wil'ing haess connector mounting brackets are provided at the top of the engine to permit quick disconnecting of electrical circuits from the vehicle. 3-151. Circuit Designations 'he circuit numhers assigned to the electrical cir- cuits are listed in table 3-28. Each harness or elec- . trical lead has a mun bered band to identify the circuit. The band number is shown at the termina- tion of each circuit on wiring diagrams (figs. 3-293 · through 3-296). 1'C1ble 3-28. Circuit Numbers Ci 1·c11 ii No. Circuit 1m1e I Generator to engine disconnect. 2 Generator to engine disconnect. 14 Starter low vollagc protection relay (2 terminals 2C) to transmission disconnect. Transmission neutral shift switch 10 transmission disconnect and Lransmission disconnect to engine disconnect. l4A Starter low voitage protection relay to starter. 33 Engine oil lcmpral urc transmitter to engine disconnect. 36 ngine oil pressuro transitler 10 engine disconnect. 54A Fuel shutoff to engine disconnect. 81 Starter to engine disconnect. 321 Transmission oil pres�ure transmitter to transmission discon- nect und tns1nission disconnect to engine disconnect. 324 Transmission oil temperature tr:in�milter lo transmission disconnect nnd transmission disconnect to engine discon- nect. 415 Generator lo generator blower motor (2D only). 478 Gencrntor to engine disconnect (20 only). Ci,.cnit No. Circuil 1111me 486 Manifold pre-heaters (2) and foci solenoid lo lrnn�mission disconnect and engine disconnect. Re:ir fuel solenoid l transmission disconnect. 509L Engine high oil tempcrnture lr:insmiiter :ind .:nginc low oil pressure transil fer to engiJ1c disconnect. Tr:rnsmission high oil temperature LraJJSmilter to tr.1nsmission di�c(rn· nect nd transmission disconnct to engine disconnect. 530/ Hour meter and fuel/w;1ter separntor to engine disconnect 531 (2C only). llour meter nd fuel/wter scpnrator to starter low voltage protection relay and genetor (2D only). 533 Gencrntor to engine disconnect (2C only). 534 Generator to engine disconnect (2 only). 920A Smoke generating system fuel solenoid vacs to cngin disconnect. 3-152. Cleaning Refer to paragraph 3-36 for cleaning instructions for electrical cables. 3-153. Inspection Inspect the engine and transmission wiring har- ness assemblies, starter cables, generator cable and blower 1notor harness (2D only) for broken leads, frayed insulation, and deterioration. In- spect the connectors. couplings, clips and brack- ets for damage. Check individual circuits, figures 3-293, 3-29tl, and 3-295 or 3-296, for continuity. 3-154. Wiring Haess and Cable Repair a. General . (J) Repair of h:lmesses and powerplant wiring is limited to replacement of faulty connectors and to the substitution of a jumper wire for a defective haess wre. When repair is necessnry, free the lead, haess, or cable only insofar as necessary to effect the repafr. This consists of disconnecting the connectors at each encl, and loosening or removing cable clamps, as required. Removal of the complete haess, especially in the case of the longer and more complex haesses, should be avoided. WARNING Some wmng haesses and cables are hol. :llthough MASTER BATfER Y switch is in OFF position. (2) Disconnect the three battery ground cable assemblies prior to disconnecting any wiring har- ness or cable. b. Replaceme11/ of Co1111ectors. Refer to fi gures 3-305, 3-306 and 3-307 for instructions conceing replacement of cable connectors, f emalc plugs, male plugs, and male receptacles. Change 3 3-204.1