Service Manual

Testing(continued)
5.TheswitchterminalsaremarkedasshowninFigure189.Thecircuitlogic
ofthePTOswitchisshowninthechartbelow.Withtheuseofamultimeter
(ohmssetting),theswitchfunctionscanbetestedtodeterminewhether
continuityexistsbetweenthevariousterminalsforeachswitchposition.
Verifycontinuitybetweenswitchterminals.ReplacePTOswitchiftesting
identiesthatswitchisfaulty.
SWITCHPOSITIONCLOSEDCIRCUITSOPENCIRCUITS
OFF(DOWN)COMB+NCB
COMC+NCC
COMB+NOB
COMC+NOC
ON(UP)COMB+NOB
COMC+NOC
COMB+NCB
COMC+NCC
6.IfPTOswitchtestscorrectlyandcircuitproblemstillexists,checkwire
harness(seeAppendixA(pageA–1)).
7.Aftertestingiscompleted,connectthewireharnessconnectortothePTO
switch.
8.Assemblecontrolarm(seeControlArm(page8–12)).
Groundsmaster
®
4100-D&4110-D
Page6–35
ElectricalSystem:ComponentTesting
13203SLRevE