CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONSTM 9-2350-256-202-19 ELECTRICAL TROUBLESHOOTING-ContinuedMASTER WARNING LIGHT--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.K Place a jumper wire from wire 27G to terminal of masterwarning light. Place red lead of multimeter in wire 509and black lead to ground. Turn MASTER switch on, startengine, set to idle, and check for voltage. Turn engineand MASTER switch OFF. If voltage is present, replacelamp (see paragraph 6- 8). If voltage is not present, goto step L.L Reconnect connector to master warning light. Disconnectgage panel to bulkhead wiring harness from gage panel.Place a jumper wire from pin K to socket K. Place redlead of multimeter in pin A of wire 509 and black lead toground. Turn MASTER switch on, start engine, set toidle, and check for voltage. Turn engine and MASTERswitch OFF. If voltage is present, repair/replace wire509 of gage panel wiring harness (see paragraph 6-44).If voltage is not present, reconnect gage panel tobulkhead wiring harness and go to step M.M Open air inlet doors. Disconnect bulkhead to enginebracket and rear fuel tank transmitter wiring harness frombulkhead disconnect. Place red lead of multimeter insocket H of wire 509 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 N. If voltage is not present,repair/replace wire 509 of gage panel to bulkhead wiringharness from gage panel to bulkhead (see paragraph 645for dual voltage; 6-46 for single voltage).2-210
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