CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONSTM 9-2350-256-202-19 ELECTRICAL TROUBLESHOOTING-ContinuedPOWERPLANT WARNING HORN-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.A Disconnect gage panel to bulkhead wiring harness fromwarning horn relay. Place red lead of multimeter insocket A of wire 26 and black lead to ground. TurnMASTER switch on, start engine, set to idle, and checkfor voltage. Turn engine and MASTER switch OFF. Ifvoltage is present, go to step G. If voltage is not present,go to step B.B Reconnect gage panel to bulkhead wiring harness towarning horn relay. Open air inlet doors (TM 9- 2350-256-10). Disconnect bulkhead to APU, master relay, andrigger's lights wiring harness from bulkhead. Place redlead of multimeter in socket H of wire 26 and black leadto ground. Turn MASTER switch on, start engine, set toidle, and check for voltage. Turn engine and MASTERswitch OFF. If voltage is present, go to step C. Ifvoltage is not present, go to step D.C Reconnect APU control box to foot dimmer switch andbulkhead wiring harness to bulkhead. Disconnect wire 26of gage panel to bulkhead wiring harness from APUcontrol box to foot dimmer switch and bulkhead wiringharness. Place red lead of multimeter in femaleconnector of wire 26 and black lead to ground. TurnMASTER switch on, start engine, set to idle, and checkfor voltage. Turn engine and MASTER switch OFF. Ifvoltage is present, repair/replace wire 26 of gage panel tobulkhead wiring harness (see paragraph 6-45 for dualvoltage; 6-46 for single voltage). If voltage is notpresent, repair/replace wire 26 of APU control box to footdimmer switch and bulkhead wiring harness (seeparagraph 6-79 for dual voltage; 6-80 for single voltage).2-214
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