Auto Electricians · AAA Services
Alternator testing
Does a battery warning light always mean a bad alternator?
A charging-system fault can involve connections, drive components or controls as well as the alternator.
Alternator testing — planning the work
For alternator testing, a warning or failed electrical function can have several causes. Checks should connect the reported symptom to the supply, wiring, control or component involved before a replacement is chosen.
Alternator testingMore questions
More questions
about this service.
What should I do if the red battery light appears while driving?
Follow the vehicle handbook and describe any accompanying warning or temperature change. Stop in a safe place and seek assistance.
What should be covered at handover?
Check restored function, fault status and any further diagnostic work.
Alternator testing by area
Select a place to view this service for that location. Please provide the postcode when you enquire.
England · East Midlands116 place pages
AlfretonArnoldAshbourneAshby-de-la-ZouchBaldertonBarwellBeestonBelperBinghamBirstallBlaby and WhetstoneBlythBolsoverBostonBourneBrackleyBradwellBreaston and DraycottBrimingtonBroughton AstleyBurton LatimerBuxtonCalvertonCarltonCastle DoningtonChesterfieldClay CrossCliftonClowneCoalvilleCorbyCotgraveCountesthorpeDaventryDerbyDesboroughDronfieldEarl ShiltonEast LeakeEastwoodEckingtonEnderby and NarboroughForest TownGainsboroughGlossopGranthamHadfieldHarworth and BircotesHeanorHigham FerrersHiltonHinckleyHolbeachHorncastleHucknallIlkestonIrthlingboroughKetteringKibworth Beauchamp and Kibworth HarcourtKillamarshKirkby-in-AshfieldLeicesterLeicester Forest East and Kirby MuxloeLincolnLong EatonLoughboroughLouthLutterworthMablethorpeMansfieldMansfield WoodhouseMarket HarboroughMatlockMelton MowbrayMountsorrelNew MillsNew Ollerton and OllertonNewark-on-TrentNorth HykehamNorth Wingfield and HolmewoodNorthamptonNottinghamNuthall and WatnallOadbyOakhamRainworthRaundsRetfordRipleyRothwellRuddingtonRushdenSandiacreShepshedShirebrookSilebySkegnessSleafordSomercotes and SwanwickSouth Normanton and PinxtonSouthwellSpaldingStamfordStaplefordStaveleySutton in AshfieldSwadlincoteSystonThorntonThurmastonTowcesterWellingboroughWest BridgfordWhitwickWigstonWorksop
England · East of England137 place pages
Abbots Langley and Kings LangleyAmpthillAttleboroughAveleyBaldockBasildonBecclesBedfordBerechurchBerkhamstedBiggleswadeBillericayBishop's StortfordBorehamwoodBradwellBraintreeBrandonBrentwoodBrightlingseaBuckhurst HillBuntingfordBurnham-on-CrouchBuryBury St EdmundsBusheyCaister-on-SeaCambourneCambridgeCanvey IslandChadwell St MaryChafford Hundred and West ThurrockChatterisChelmsfordCheshuntChigwellChorleywoodClacton-on-SeaCliftonColchesterCromerDerehamDissDownham MarketDunstableElyEppingFakenhamFelixstoweFlitwickGodmanchesterGorleston-on-SeaGraysGreat DunmowGreat NotleyGreat YarmouthHadleighHalsteadHarlowHarpendenHarwichHatfieldHaverhillHemel HempsteadHertfordHiltonHiston and ImpingtonHitchinHockley and HawkwellHoddesdonHoughton RegisHuntingdonIpswichKempstonKesgraveKing's LynnLeighton BuzzardLetchworthLittleportLondon ColneyLoughtonLowestoftLutonMaldonMarchMildenhallNewmarketNewportNorth WalshamNorwichPeterboroughPotters BarRadlettRayleighRickmansworthRochfordRoystonRunwellSaffron WaldenSandySawbridgeworthSawstonSheffordSohamSouth OckendonSouth Woodham FerrersSouthend-on-SeaSt AlbansSt IvesSt NeotsStanford-le-HopeStansted MountfitchetStevenageStotfoldStowmarketSudburySwaffhamTaverham and DraytonThetfordThundersley and South BenfleetTilburyTiptreeTringWaltham AbbeyWaltham CrossWareWatfordWattonWelwyn Garden CityWhittleseyWickfordWisbechWithamWivenhoeWoodbridgeWoottonWymondhamYaxley
England · London1 place pages
England · North East63 place pages
AlnwickAnnfield PlainAshingtonBedlingtonBerwick-upon-TweedBillinghamBirtleyBishop AucklandBlaydonBlythBrandonChester-le-StreetConsettCramlingtonCrawcrook and GreensideCrookDarlingtonDinningtonDudleyDurhamEgglescliffeEstonFerryhillGatesheadGuisboroughHartlepoolHebburnHetton-le-HoleHexhamHoughton-le-SpringIngleby BarwickJarrowKillingworthLongbentonMarske-by-the-SeaMiddlesbroughMorpethNewcastle upon TyneNewton AycliffePelton and OustonPeterleePontelandPrudhoeRedcarRytonSeahamSeaton DelavalShildonShiney Row and PenshawSouth ShieldsSpennymoorStakefordStanleyStockton-on-TeesSunderlandThornaby-on-TeesTynemouthWallsendWashingtonWhickhamWhitley BayWideopenYarm
England · North West163 place pages
AccringtonAdlingtonAlsagerAltrinchamAshton-in-MakerfieldAshton-under-LyneAthertonAudenshawBacupBamber BridgeBarnoldswickBarrow-in-FurnessBebingtonBirkenheadBlackburnBlackpoolBoltonBootleBramhallBredbury and WoodleyBrierfieldBurnleyBurscoughBuryCarlisleChaddertonCheadleCheadle HulmeChesterChorleyClayton-le-MoorsCleveleysCliftonClitheroeCockermouthColneCongletonCoppullCreweCrosbyDalton-in-FurnessDarwenDavenhamDentonDroylsdenDukinfieldEcclesEllesmere PortElworthEuxtonFailsworthFarnworthFleetwoodFormbyFrodshamFulwoodGatleyGolborneGreasbyGreat HarwoodHaleHaslingdenHaydockHazel GroveHeswallHeyshamHeywoodHindleyHorwichHuyton with RobyHydeInce-in-MakerfieldIrlamKearsleyKendalKirkbyKirkhamKnutsfordLancasterLeesLeighLeylandLitherlandLittle HultonLittle LeverLittleboroughLiverpoolLongridgeLongtonLymmLytham St Anne'sMacclesfieldMaghullManchesterMarpleMaryportMiddletonMiddlewichMilnrowMorecambeMossleyNantwichNelsonNestonNewton-le-WillowsNorthwichOld TraffordOldhamOrmskirkOrrellOswaldtwistlePadihamPartingtonPenrithPenworthamPlatt Bridge and AbramPoulton-le-FyldePoyntonPrescotPrestonPrestwichRadcliffeRamsbottomRawtenstallReddishRochdaleRomileyRoytonRuncornSaleSalfordSandbachSeatonShawSkelmersdaleSouthportSt HelensStalybridgeStandishStaveleyStockportStretfordSwintonTarleton and Hesketh BankThorntonTyldesleyUlverstonUppermillUrmstonWalkdenWallaseyWarringtonWest KirbyWesthoughtonWhitefieldWhitehavenWidnesWiganWilmslowWinsfordWorkingtonWorsleyWythenshawe
England · South East220 place pages
Abingdon-on-ThamesAddlestoneAldershotAltonAmershamAndoverAscotAsh and Ash ValeAshfordAshford CommonAshingtonAshleyAshteadAylesburyBanburyBansteadBarnhamBasingstokeBeaconsfieldBearstedBentleyBexhill-on-SeaBicesterBillingshurstBletchleyBognor RegisBordonBracknellBrighton and HoveBroadstairsBuckinghamBurgess HillBursledonByfleetCamberleyCanterburyCartertonCaterhamCavershamChalfont St PeterChandler's FordChathamChertseyCheshamChichesterChinnorCobhamCowesCoxheathCranleighCrawleyCrowboroughCrowthorneDartfordDealDidcotDorkingDoverEast CowesEast GrinsteadEastbourneEastleighEcclesEdenbridgeEghamEmsworthEpsomEsherEwellFarehamFaringdonFarnboroughFarncombeFarnhamFavershamFlackwell Heath and Wooburn GreenFleetFolkestoneFreshwater and TotlandFrimleyGerrards CrossGillinghamGodalmingGosportGravesendGreat Bookham and FetchamGroveGuildfordHailshamHaslemereHassocks and HurstpierpointHastingsHavantHawkingeHaywards HeathHazlemereHeathfieldHedge EndHenley-on-ThamesHerneHerne BayHershamHigh WycombeHolburyHoo St WerburghHookHorleyHorndeanHorshamHytheHythe and Dibden PurlieuKidlingtonKings HillLancing and SomptingLarkfieldLeatherheadLee-on-the-SolentLeighLewesLittlehamptonLocks HeathLongfield, New Ash Green and HartleyLymingtonMaidenheadMaidstoneMargateMarlowMilton KeynesMinsterNew Haw, West Byfleet and SheerwaterNew MiltonNewburyNewhavenNewportNewport PagnellNorthfleetOld Windsor and WraysburyOtford and KemsingOxfordOxtedPaddock WoodPeacehavenPetersfieldPolegatePortsmouthPrestwood and Great MissendenPrinces RisboroughRamsgateReadingRedhillReigateRingwoodRipleyRochesterRomseyRoyal Tunbridge WellsRusthall and Langton GreenRustingtonRydeSandhurstSandownSeafordSelseySevenoaksShanklinSheernessShoreham-by-SeaSittingbourneSloughSnodlandSouth HaylingSouth MersthamSouthamptonSouthboroughSouthwaterSouthwickSpencers Wood and Three Mile CrossStaines-upon-ThamesStanwellStoneStorringtonSunbury-on-ThamesSwanleySwanscombeTadleyTadworth and Epsom DownsTenterdenThameThatchamTonbridgeTottonTwyfordUckfieldWallingfordWalton-on-ThamesWantageWarlinghamWaterloovilleWendoverWest EndWest End and ChobhamWest MoleseyWeybourneWeybridgeWhitchurchWhiteleyWhitstableWickWinchesterWindsorWinnershWitneyWokingWokinghamWoodleyWoottonWorcester Park and StoneleighWorthingWreccleshamYateley
England · South West127 place pages
AmesburyBarnstapleBathBidefordBishop's CleeveBlandford ForumBodminBournemouthBradford-on-AvonBradley StokeBridgwaterBridportBristolBrixhamBrockworthBudeBurnham-on-SeaCalneCamCamborneChardCheltenhamChippenhamChipping SodburyChristchurchChurchdownCinderfordCirencesterClevedonCorfe MullenCorshamCreditonCullomptonDawlishDevizesDorchesterDursleyExeterExmouthFalmouthFerndownFiltonFrampton Cotterell and WinterbourneFromeGillinghamGlastonburyGloucesterGroveHayleHeathfieldHelstonHighworthHonitonIlfracombeIvybridgeKeynshamKingsteigntonKingswood and FishpondsLauncestonLiskeardLydneyMarlboroughMelkshamMidsomer NortonMineheadNailseaNewquayNewton AbbotOkehamptonPaigntonPatchwayPenrynPenzancePlymouthPool and IlloganPoolePortisheadQuedgeley and HardwickeRadstockRedruthRoyal Wootton BassettSalisburySaltashSeatonShaftesburyShepton MalletSherborneSidmouthSouthwellSouthwickSt AustellSt IvesStoke GiffordStonehouseStratton St MargaretStreetStroudSwanageSwindonTauntonTavistockTeignmouthTewkesburyThornburyTidworthTivertonTorquayTotnesTrowbridgeTruroUptonVerwoodWarminsterWellingtonWellsWest HillWest MoorsWestburyWeston-super-MareWeymouthWhitchurchWickWimborne MinsterWroughtonYateYattonYeovil
England · West Midlands93 place pages
AldridgeAtherstoneBedworthBewdleyBiddulphBilstonBirminghamBloxwichBridgnorthBrierley HillBromsgroveBrownhillsBurntwoodBurton upon TrentCannockCatshillCheadleCodsallCoseleyCoventryCradley HeathDarlastonDroitwich SpaDudleyEckingtonEveshamFazeleyFeatherstoneGreat MalvernGreat Wyrley and Cheslyn HayHalesowenHerefordHuntingtonKenilworthKidderminsterKidsgroveKingswinfordKnowle and DorridgeLedburyLeekLeominsterLichfieldLudlowMarket DraytonNewcastle-under-LymeNewportNorton CanesNuneatonOldburyOswestryPelsallPenkridgePershorePertonPheaseyPolesworth and DordonRedditchRoss-on-WyeRowley RegisRoyal Leamington SpaRoyal Sutton ColdfieldRugbyRugeleyRushall and ShelfieldSedgleyShifnalShrewsburySmethwickSolihullSouthamStaffordStoke-on-TrentStoneStourbridgeStourport-on-SevernStratford-upon-AvonStreetlySwindonTamworthTelfordTiptonUttoxeterWalsallWarwickWednesburyWest BromwichWhitchurchWhitnashWillenhallWolverhamptonWombourneWood EndWorcester
England · Yorkshire and The Humber123 place pages
Adwick le StreetArmthorpeBaildonBarnsleyBarton-upon-HumberBarugh Green and RedbrookBatleyBentleyBeverleyBingleyBolton upon DearneBradfordBridlingtonBrighouseBrinsworthBroughCarltonCastlefordCatterick GarrisonChapeltown and High GreenCleckheatonCleethorpesConisbroughCottinghamCudworth and ShaftonDartonDewsburyDinningtonDoncasterDriffieldDunscroft and HatfieldEast ArdsleyEcclesfield and GrenosideEllandFeatherstoneGarforthGoldthorpeGomersal and BirkenshawGooleGrimsbyGuiseleyHalifaxHarrogateHaxbyHeckmondwikeHedonHemsworthHessleHonleyHookHorburyHornseaHoylandHuddersfieldHumberston and New WalthamHuntingtonIlkleyImminghamKeighleyKingston upon HullKippaxKirk Sandall and EdenthorpeKnaresboroughKnottingleyLeedsLinthwaite and SlaithwaiteLiversedgeMaltbyMarket WeightonMelthamMexboroughMirfieldMorleyNew Rossington and RossingtonNormantonNorthallertonNorton-on-DerwentOssettOtleyPenistonePocklingtonPontefractPrestonPudseyQueensburyRawmarshRichmondRiponRotherhamRothwellRoystonScarboroughScawthorpe and CusworthScunthorpeSelbySheffieldShelf and NorthowramSherburn in ElmetShipleySilsdenSkiptonSouth ElmsallSouth KirkbySprotbroughStocksbridgeSwallownest and AstonSwintonThorneThorntonThurnscoeTodmordenUptonWakefieldWarmsworthWath upon DearneWetherbyWhitbyWickersley and BramleyWillerby and AnlabyWombwellWorsbroughYeadonYork
London · Barking and Dagenham11 place pages
London · Barnet3 place pages
London · Brent8 place pages
London · Bromley8 place pages
London · Croydon2 place pages
London · Ealing22 place pages
London · Enfield2 place pages
London · Greenwich1 place pages
London · Hammersmith and Fulham13 place pages
London · Haringey19 place pages
London · Harrow1 place pages
London · Havering1 place pages
London · Hillingdon3 place pages
London · Hounslow15 place pages
London · Islington15 place pages
London · Kensington and Chelsea10 place pages
London · Kingston upon Thames2 place pages
London · Lambeth18 place pages
London · Lewisham4 place pages
London · Merton1 place pages
London · Newham7 place pages
London · Redbridge1 place pages
London · Southwark18 place pages
London · Tower Hamlets4 place pages
London · Waltham Forest18 place pages
London · Wandsworth5 place pages
Northern Ireland10 place pages
Scotland50 place pages
AberdeenAirdrieArbroathAyrBarrheadBathgateBearsdenBellshillBishopbriggsBlantyreBonnyriggBroxburnCambuslangClydebankCoatbridgeCumbernauldDumbartonDumfriesDundeeDunfermlineEast KilbrideEdinburghElginFalkirkGlasgowGlenrothesGrangemouthGreenockHamiltonInvernessIrvineJohnstoneKilmarnockKilwinningKirkcaldy and DysartKirkintillochLivingstonMotherwellMusselburghNewton MearnsPaisleyPenicuikPerthPeterheadRenfrewRutherglenSt AndrewsStirlingViewparkWishaw