TestingtheKeySwitch(continued)
4.IftheSCMdeterminesthatthekeyswitchandcircuitwiringarenot
functioningcorrectly,thentestthekeyswitchasfollows:
A.Removethe4thumbscrews(item3inFigure128)thatsecurethecontrol
paneltothefueltank.
B.EnsurethatthekeyswitchisintheOFFposition.Disconnectthewire
harnessconnectorfromthekeyswitch.
C.Thekeyswitchterminalsareidentiîš¿edinFigure129andthecircuitryof
thekeyswitchisshownintheCircuitLogicT able(page6–28).Withthe
useofamultimeter(ohmssetting),testtheswitchfunctionstodetermine
ifthecontinuityexistsbetweenthevariousterminalsforeachswitch
position.Checkthecontinuitybetweentheswitchterminals.
CircuitLogicTable
SwitchPositionCircuits
OFF
None
RUN
B+C+F,D+E
STARTA+B+C
D.Replacethekeyswitchiftestingdeterminesthattheswitchisdamaged.
E.Ifthekeyswitchtestingiscorrectandacircuitproblemstillexists,check
thewireharness;refertotheElectricalSchematicsandWireHarness
Drawings/DiagramsinAppendixA(pageA–1).
F.Afteryoucompletethetesting,connectthemachinewireharness
connectortothekeyswitch.
G.Securethecontrolpaneltothemachinewiththe4thumbscrews.
ElectricalSystem:TestingtheElectricalComponents
Page6–28
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