RelayswithFour(4)Terminals
g288551
Figure240
1.Frontpowercenter
4.TECpowerrelay2
2.Hornrelay
5.TECpowerrelay1
3.Mainpowerrelay
TheGroundsmaster5900and5910useanumberofelectricalrelaysthathave
four(4)terminals.Atagnearthewireharnessrelayconnectorcanbeusedto
identifyeachrelay.Thefollowingrelaysarelocatedinthefrontpowercenter
behindtheoperator’sseat(Figure240):
•ThemainpowerrelaysupplieselectricalpowerfortheInfoCenterDisplay,
operatorseatcompressor,powerpointreceptacle,hornswitch,roadlight
switch,brakelightrelayandoptionalelectricalequipment.Themainpower
relayisenergizedwhenthekeyswitchisintheSTARTorRUNposition.
•Two(2)controllerrelayssupplypowerforthemasterandslavecontroller
outputs.TECpowerrelay1suppliesmastercontrollerPWR4(outputs
11−14)andslavecontrollerPWR2−4(outputs1−14).TECpowerrelay2
suppliesmastercontrollerPWR2−3(outputs1−10).TheTECpowerrelays
areenergizedwhenthekeyswitchisintheSTARTorRUNposition.
•Thehornrelaysuppliespowertothehorn.Thehornrelayisenergizedwhen
thekeyswitchisintheSTARTorRUNposition(mainpowerrelayenergized)
andthehornbuttonispressed.
Groundsmaster
®
5900&5910
Page6–99
ElectricalSystem:ComponentTesting
16227SLRevB
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