CHAPTER 2; VEHICLE MAINTENANCE INSTRUCTIONSTM 9-2350-256-202-19 ELECTRICAL TROUBLESHOOTING-ContinuedENGINE MANIFOLD PREHEATER SYSTEM-ContinuedWARNINGRemove all jewelry such as rings, dog tags,bracelets, etc. If jewelry contacts a metalsurface a direct short may result in instantheating of tools, damage to equipment, andinjury or death to personnel.I Remove engine deck (see paragraph 9-51). Reconnectwire 486 at connector near bulkhead disconnect.Disconnect bulkhead to engine bracket and rear fuel tanktransmitter wiring harness from engine disconnect. Placered lead of multimeter in socket A of wire 486 and blacklead to ground. Turn MASTER switch ON, push STARTand manifold preheat switches, and check for voltage.Turn MASTER, START and manifold preheat switchesOFF. If voltage is present, go to step J. If voltage is notpresent repair/replace wire 486 of bulkhead to enginebracket and rear fuel tank transmitter wiring harness (seeparagraph 6-73 for dual voltage; 6-74 for single voltage).NOTESteps J through N are the same for both leftand right preheaters and fuel solenoids.Perform J through N as necessary for eachside.J Remove powerplant (see paragraph 3-1). Reconnectbulkhead to engine bracket and rear fuel tank transmitterwiring harness to engine disconnect. Disconnect enginewiring harness from manifold preheater ignition unit.Place red lead of multimeter in socket A of wire 486 andblack lead to ground. Turn MASTER switch on, pushSTART and manifold preheat switches, and check forvoltage. Turn MASTER, START, and manifold preheatswitches OFF. If voltage is present, go to step K. Ifvoltage is not present, repair/replace wire 486 of enginewiring (see paragraph 6-58 for dual voltage; 6-59 forsingle voltage).2-76
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