MGTC Electrical Circuits - mg-tabc.org · EXU Supplement 4 January 2019 Version 1.0 Page 1 Introduction Background This is a supplement to the document titled “MGTC Electrical Circuits”,

MGTC Electrical Circuits The EXU Supplement RichardStormsAbingdonRoughRidersJanuary2019Version1.0

MGTCElectricalCircuitsEXUSupplement

TableOfContents

Introduction..............................................................................................................................1Background.........................................................................................................................................1Nomenclatures...................................................................................................................................2References...........................................................................................................................................2

MultipleCircuitComponents...............................................................................................3RF95ControlBox..............................................................................................................................3Lighting&IgnitionSwitch..............................................................................................................4HornPush&DipperSwitch...........................................................................................................5Ammeter..............................................................................................................................................6PanelEarthingStud..........................................................................................................................7

BasicCircuits.............................................................................................................................8TheChargingandAuxiliaryPowerCircuits.............................................................................8TheIgnitionWarningLightCircuit.............................................................................................9IgnitionCircuit................................................................................................................................10Headlights.........................................................................................................................................11SideandTailLights.......................................................................................................................12Horn....................................................................................................................................................13Dash/PanelLightsandClock....................................................................................................14PetrolWarningLight.....................................................................................................................15MapLights.........................................................................................................................................16PetrolPump.....................................................................................................................................17ScreenwiperMotor........................................................................................................................18DirectionalIndicatorLightsandStopLights........................................................................19

Appendix.................................................................................................................................20UsedWireNumbersandColorsbyWireNumber...............................................................20


RevisionLogThisisaworkingdocument,assuchchangeswillbemadeasnewinformationemerges,enhancementtoimprovethereadabilityorerrorsarefound.Belowisalistoftheseupdates.January4,2019–Version1.0InitialIssue


4January2019 Version1.0 Page 1

IntroductionBackgroundThisisasupplementtothedocumenttitled“MGTCElectricalCircuits”,coveringjustthe1949MGTCEXUmodel.TheTCwasupgraded,electronicallytocomplywithvariouscountry(mostlytheUnitedStates)lawsandregulationsregardingautomobiles.Amongthesewereelectricalturnsignals,sealedheadlights,andlicenseplateilluminationlights.Foreaseofuse,I’veincludedallthecircuitsoftheEXUinthisdocumenteveniftheyareidenticaltothenon-EXUmodel.CircuitsthatAretheSame

! ChargingandAuxiliaryPower! Ignition! IgnitionWarningLight! PetrolPump! ScreenwiperMotor

CircuitsthatNeworRevised

! Headlights! SideandTailLights! Horn! Dash/PanelLightsandClock! PetrolWarningLight! MapLights! DirectionalIndicatorLightsandStopLights

CircuitsthatHaveBeenEliminated

! FogLamp! StopLights(NowintegratedinwiththeDirectionalIndicators)! InspectionSockets

Again,Idonotprofesstobeanyformofexpertonelectronics.AlltheinformationIampresentinghereisextractedfromnumerous.Shouldyoufindanerror,[email protected].



NomenclaturesSomenotesregardinglabelingofitem:

! Inallcases“Left”isthepassengerside,“Right”isdriver’sside.! LHisLeftHand,RHisRightHand! SWisSwitch! w/standsforWith! ThenamesGeneratorandDynamoareinterchangeable.Ihavechosentouse

Generator! LampandLightareinterchangeable.IhavechosentouseLight,exceptfor

theD-Lampname.ReferencesNoAuthorListed.1954,TheInstructionManualfortheMGSeries“TC”MidgetBall,Kenneth.1968,MGAutobookOneBlower,W.E.1952,TheMGWorkshopManualFrom“M”Typeto“T.F.1500”



MultipleCircuitComponentsFiveofthecomponentsareusedinmultiplecircuits.Sinceeachcircuitdescriptiononlydealswiththewiringthatisusedbyjustthatcircuit,I’mincludinganoveralllookofalltheconnectionsusedbyeachofthesecomponents.RF95ControlBoxWhat’sNeworChanged: A4toIndicatorFlasherUnit,EtoPanelEarthingStudin

lieuofHornPushandDipperSwitch

A1

A

A2

F

D

A4

A4 A3

E

Lighting & Ignition Switch

Ammeter

Generator Generator Ignition Warning Light

Indicator Flasher Unit Stop Light Switch

Screen Wiper Motor Petrol Warning Light

Ground Panel Earthing Stud Petrol Pump Screen Wiper Motor

Coil Lighting & Ignition Switch

Black

White

Green

Green Yellow w/Green

Brown w/ White

Brown w/ Blue

Yellow

Not Used



Lighting&IgnitionSwitchPowerenterstheswitchatconnectionA(Input)andexitsthroughIG(Ignition),H(Headlights)andT(TailandSideLights).ConnectionL(Lighting)isnotused.WhenthekeyisturnedonaconnectionismadebetweenAandIG,whichthenconnectstoterminalA3ontheRF95ControlBox.All“IgnitionOn”circuitsarecontrolledbythisconnection.SettingtheswitchtoS(Side/Tail)willcreateaconnectionbetweenAandT.WhensettoH(Headlights)thisconnectsAtobothHandT.What’sNeworChanged: TconnectionisnowasinglelinetoFrontSideLights

LH & RH Rear Tail Lights LH & RH Front Side Lights Panel Light Switch

A

IG

H T

L

RF95 Control Box

RF95 Control Box Ignition Warning Light

Horn Push & Dipper Switch

Brown w/Blue

White

Blue

Red



HornPush&DipperSwitchWhat’sNeworChanged: GroundsdirectlytoPanel,Hornconnection(“P”)now

Brownw/Black

Blue

Blue w/White Blue w/Red

Brown w/Black



AmmeterNotethelabelingofBandAisconsistentinallthewiringdiagrams.What’sNeworChanged: EliminationofconnectionBtoInspectionLampSocket

B A

Brown Brown w/White RF95 Control Box Starter

Map Reading Light



PanelEarthingStudThePanelEarthingStudisnewtotheEXU;itreplacesthegroundconnectionsfromtheInspectionLightSocket.

Map Reading Lights LH Relay Unit Dash / Panel Lights Directional Indicator Switch RF95 Control Box



BasicCircuitsTheChargingandAuxiliaryPowerCircuitsPowerSource: Batteryand/orGeneratorIgnitionOnorOff: OnSwitchSettings: N/AWhat’sNeworChanged: NoneRefertotheMGTCElectricalCircuitsdocumentforadetaildescriptionofthiscircuit.



TheIgnitionWarningLightCircuitPowerSource: Batteryand/orGeneratorIgnitionOnorOff: OnSwitchSettings: N/AWhat’sNeworChanged: NoneRefertotheMGTCElectricalCircuitsdocumentforadetaildescriptionofthiscircuit.



IgnitionCircuitPowerSource: Batteryand/orGeneratorIgnitionOnorOff: OnSwitchSettings: N/AWhat’sNeworChanged: NoneRefertotheMGTCElectricalCircuitsdocumentforadetaildescriptionofthiscircuit



HeadlightsPowerSource: Batteryand/orGeneratorIgnitionOnorOff: EitherSwitchSettings: Lighting&IgnitionSwitch: H HornPush&DipperSwitch: DorHWhat’sNeworChanged: MainBeamWarningLight,PanelEarthStud



SideandTailLightsPowerSource: Batteryand/orGeneratorIgnitionOnorOff: EitherSwitchSettings: Lighting&IgnitionSwitch: SorHWhat’sNeworChanged: MultipleTailLights,NumberPlateLight,Singlewire

fromtheLighting&IgnitionSwitchtobothFrontSideLightsandRearTailLights.



HornPowerSource: BatteryIgnitionOnorOff: EitherSwitchSettings: HornPush&DipperSwitch: HornButtonPushedWhat’sNeworChanged: MultipleHorns,NewColorScheme,DirectConnectto

Battery,Fuse



Dash/PanelLightsandClockPowerSource: Dash/PanelLights: Batteryand/orGenerator Clock: BatteryIgnitionOnorOff: EitherSwitchSettings: Dash/PanelLights: Lighting&IgnitionSwitch: SorH DashLightSwitch: On Clock: N/AWhat’sNeworChanged: RemovalofInspectionSockets,AddedEarthStudThewiringfortheClockisnotshownonthegeneralwiringdiagram,soI’massumingthatitisthesameastheVariation3.



PetrolWarningLightPowerSource: Batteryand/orGeneratorIgnitionOnorOff: OnSwitchSettings: N/AWhat’sNeworChanged: RemovalofFogLightSwitchandFogLight



MapLightsPowerSource: BatteryIgnitionOnorOff: EitherSwitchSettings: MapReadingLightSwitch: OnWhat’sNeworChanged: RemovalofInspectionLightSocket,addedEarthStud



PetrolPumpPowerSource: Batteryand/orGeneratorIgnitionOnorOff: OnSwitchSettings: N/AWhat’sNeworChanged: None



ScreenwiperMotorPowerSource: Batteryand/orGeneratorIgnitionOnorOff: OnSwitchSettings: ScreenwiperSwitch: OnWhat’sNeworChanged: None



DirectionalIndicatorLightsandStopLightsPowerSource: Batteryand/orGeneratorIgnitionOnorOff: OnSwitchSettings: DirectionalSwitch: LeftorRightTurnand/or StopLightSwitch: BrakesAppliedWhat’sNeworChanged: Theentirecircuitisnew



AppendixUsedWireNumbersandColorsbyWireNumberNbr Color1 Blue2 Bluew/Red4 Bluew/White9 White16 Whitew/Black17 Green18 * Greenw/Red19 * Greenw/Yellow20 * Greenw/Blue21 * Greenw/White22 # Greenw/Purple24 Greenw/Black25 Yellow29 Yelloww/Green33 Brown36 Brownw/Blue37 Brownw/White38 + Brownw/Green40 + Brownw/Black41 Red42 Redw/Yellow44 Redw/White49 Purple56 Purplew/Black57 Black*NewColorsAdded–DirectionalIndicators+NewColorsAdded-Horn#ExistingColorusedinnewCircuit-DirectionalIndicators

MGTC Electrical Circuits - mg-tabc.org · EXU Supplement 4 January 2019 Version 1.0 Page 1 Introduction Background This is a supplement to the document titled “MGTC Electrical Circuits”,

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