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Discussion Starter · #1 ·
Hi, MK6, bobbly front lights think that's pre facelift?

Alternator had a bearing go so we had a new one fitted, then shortly after car battery kept going flat. presumed old battery so replaced with new - but there is still a draw kicking it but intermittently & at times several Amps. Feels like the alternator might have an issue - but bizarre as its putting out 14v when running and this drain is always when the car is of, overnight.

Its been to a very trusted garage and they have tried all the obvious interior lights, dash, radio, Parrot bluetooth kit etc - disabled one by one but still overnight that battery is going flat.

Really cant afford for this to become an expensive investigation and just curious if there are any known faults out there or common things to look for with this model - or a good fault finding process?

Thanks
 

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Do you have an amp meter?

Connect it into the wiring, usually between the battery earth post and the earth lead (connected in series) you will need to wait 20 mins or so for the car to shut down.

check the amp reading, should be 0.02 or less, if its higher then you can start disconnecting things and watching if the amps drop, or start removing fuses one by one to find the circuit then narrow it down from there.

leave the doors open while its shutting down, or it will spring to life again when you open the door!

That way you can normally find the circuit at least quite quickly without having to leave it overnight to find out

the alternator 12v wire can be disconnected (safely) to tell you if that is the cause also
 

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Discussion Starter · #3 ·
Thanks Zippy. That was my train of thought re fuses. I have a multimeter but not the amp tool but my mechanic does, the issue is he keeps seeing periodic draw so it's weird.

Did disconnect the alternator and it doesnt look like that's the fault and he's been through all the obvious, heated mirrors, internal lights etc. Currently trying the radio out (and it has aftermarket Bluetooth) the challenge is even after the 20 min shutdown it can show no draw but then now and then it's like something wakes up, he'll see a few AMp but then it drops.

Something's got a parasitic drain or something in the whole system keeps waking up. Just wondering if any commons places to look etc
 

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Discussion Starter · #5 ·
Still having problems..it's super weird as intermittent. Car can go a few days fine then it's flat. With Amp meter in it occasionally see about an amp, every now and then it goes to 4amp for a bit then off. Trying to pull fuses but it's super random when it's drawing.
 

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Discussion Starter · #6 ·
Garage is stumped too. Had the car a few weeks. Can be ok for a week, then die in a day. Something is waking up or intermittently drawing power.

Super weird.
 

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"Race Red Owner"
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@lukeysl Definitely not like the Mk7 glovebox light is it with a dodgy switch leaving the light on? any of these internal lights (boot for another) could eat away the amps without ever seeing it. Is it not worth removing all the filaments and seeing if it goes away??
 

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Mk6 Fiesta ST150, 2006, Panther Black
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If it's intermittent then pull some unneeded fuses then wait and see.
 

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2005 mk6 Fiesta ST
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Long shot but I've heard someone say that some aftermarket throttle bodies can drain the battery. If you ever hear the TB making that weird high pitched noise when the car is off you will know what I am talking about.
As above a process of elimination should work
 

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Discussion Starter · #10 ·
Hi everyone, appriciated. Glovebox and boot we definitely tried. The odd thing is the inconsistency. Where they consistent i.e. didn't go off or kick back in periodically?

Pulling fuses is where we are at but it's bizarre. Can go a week no issues. So you think you nailed it then nope. Or it's flat every night.

It all started after new alternator but garage has checked it and all seems normal.

Interesting on throttle body, we did have a new one not so long ago I believe. I'll def get that checked too

Thanks everyone!
 

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Discussion Starter · #11 ·
Quick update. Fault still ongoing but car with a electrical specialist now. It's ultra intermittent but something is waking the car up, dash on - like something has cycled the unlock button on the key fob. The sparky thought it clocks so they been off for a check / reset but not.

He has other ideas I'll keep thread going in case I find it and helps others..
 

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2005 mk6 Fiesta ST
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Door sensors can play up but it's usually a case of the door open warning on the dash as well.
 

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Fiesta Mk6 ST Facelift
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Silly question but do you have any aftermarket radio unit?
I had a car audio store for about 20 years and saw many situations were the car radio just consuming battery no matter what.
If yes i'm suggesting to just uninstall it and wait to see.
If not any aftermarket part has to be disconnected, such as car alarm, xenon lights, led bulbs etc.
In general you ve to strip everything to check what causing the issue..
 
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