CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONSTM 9-2350-256-202-19 ELECTRICAL TROUBLESHOOTING-ContinuedEXTERNAL VEHICLE 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.F Reconnect switch panel to gage panel andmiscellaneous switches wiring harness to mainswitch panel. Disconnect wire 25 from main switchpanel side of horn switch. Place red lead ofmultimeter in wire 25 and black lead to ground.Turn MASTER switch on and check for voltage.Turn MASTER switch OFF. If voltage is present, goto step G. If voltage is not present, repair/replacewire 25 of switch panel to gage panel andmiscellaneous switches wiring harness (seeparagraph 6-55 for dual voltage; 6-56 for singlevoltage).G Reconnect wire 25 to main switch panel side of hornswitch. Disconnect wire 25 from horn side of hornswitch. Place red lead of multimeter on terminal ofhorn switch and black lead to ground. TurnMASTER switch on, push horn switch, and checkfor voltage. Turn MASTER switch OFF. If voltageis present, go to step H. If voltage is not present,replace horn switch (see paragraph 6-20).H Reconnect wire 25 to horn side of horn switch.Disconnect wire 25 from external vehicle horn.Place red lead of multimeter in wire 25 and blacklead to ground. Turn MASTER switch on, push hornswitch, and check for voltage. Turn MASTERswitch OFF. If voltage is present, go to step I. Ifvoltage is not present, repair/replace wire 25 ofhorn switch to horn lead assembly (see paragraph6-20).2-222
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