•Thetwo(2)reversefanrelaysareattachedtothebatterysupportplateunder
theoperatorseat.Whenenergized,thereversefanrelaysallowtheelectrical
currenttotheradiatorfan.
•Thekeyrelayisattachedinsidetheleftarmconsoleabovethebattery.When
energized,thekeyrelayallowtheelectricalcurrenttothemachine.
TestingtheRelayswith4Terminals
1.Parkthemachineonalevelsurface,lowerthecuttingdeck,shutoffthe
engine,settheparkingbrake,andremovethekeyfromthekeyswitch.
2.Togetaccesstotheglowrelay,forwardrelaysandreverserelays,remove
theoperatorseat;refertoRemovingtheOperatorSeat(page7–17).
3.Togetaccesstothekeyrelay,removetheleftconsole;refertoDisassembling
theBodyAssembly(page7–6).
4.Toensurethatthemachineoperationdoesnotoccurunexpectedly,
disconnectthenegative(-)cablefromthebatteryandthendisconnectthe
positive(+)cablefromthebattery;refertoServicingtheBattery(page6–51).
5.Locatetherelaythatistobetestedanddisconnectthewireharness
connectorsfromtherelay.Removetherelayfromthemountingbracketfor
testing.
Note:Beforetakingsmallresistancereadingswithadigitalmultimeter,short
themultimetertestleadstogether.Themeterdisplaysasmallresistance
value(usually0.5ohmsorless).Thisresistanceisbecauseoftheinternal
resistanceofthemultimeterandtestleads.Subtractthisvaluefromthe
measuredvalueofthecomponentthatyouaretesting.
g214499
Figure135
6.Checkthecoilresistancebetweentheterminals85and86withamultimeter
(ohmssetting).Theresistanceshouldbeapproximately72ohms.
7.Connectthemultimeter(ohmssetting)leadstorelayterminals30and87.
Groundtheterminal85andapply+12VDCtoterminal86.Therelayshould
makeandbreakcontinuitybetweentheterminals30and87as+12VDCis
appliedandremovedfromterminal86(Figure135).
8.Disconnectthevoltageandleadsfromtherelayterminals.
9.Replacetherelayiftestingdeterminesthattherelayisdamaged.
10.Iftherelaytestingiscorrectandacircuitproblemstillexists,checkthe
mainwireharness.RefertotheElectricalSchematicsandWireHarness
Drawings/DiagramsinAppendixA(pageA–1).
ElectricalSystem:TestingtheElectricalComponents
Page6–40
ProLineH800
19241SLRevB
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