Help, Ford Focus st2 battery light !!

[Playbunni7799]

Hey all just had a new alternator fitted to my 2007 plate ford focus st2 and it’s showing the battery light it’s had a new battery as well can anyone else say if they have had this problem . Or could it be the smart charge system king regards Rachel

[aka_kerrly]

Did the garage that fitted the new alternator and battery do a check to see if the battery is actually receiving charge?

Usually there is a trigger wire that runs from the alternator into the cars electrical system and then to the battery. If it's damaged it may well be that although the alternator is working the current is not being sent back to the battery hence you still see the battery light illuminated on the dash.

[Playbunni7799]

Hey thanks for the reply I have had the meter on it and it’s defiantly holding the charge where as it wasn’t before . It’s holding at 14.1 even under load I have tested both battery and alternator kind regards

[GreenV8S]

Playbunni7799 said:

just had a new alternator fitted ... it’s showing the battery light

If I were you I'd take that back to the people who fitted it, and ask them what's wrong. They should not have returned the vehicle with a fault related to the work they have just done without at least explaining it to you.

[Playbunni7799]

Hey there thanks for reply it wasn’t on when collected from the mechanic he said possibly alternator as gone again ... what’s causing it so now I have to wait again

[Tony33]

I recently had a new battery in my 2007 ST. The RAC guy said I needed to run the car at 31mph or more so it would calibrate. Wasn't really sure what he meant but did as he said! Can't imagine you haven't gone over 31mph but just in case.

[Playbunni7799]

Hey all thanks for reply’s this is the latest update battery light don’t come on only after 60 seconds of car being turned over ... once car hits 1500 revs it goes off . Both battery and alternator test came back clear I’m puzzled any ideals on this one

[chammyman]

Should be a smart charge alternator and I would say its not working. It defaults to reg 14 ish v.

The looms are crap and fail. Smart charge alts can put very high voltages out if they need to.

Default fail is 14 ish v and battery light.

The loom usually fails away from the alternator a bit.

[Playbunni7799]

The readings from the alternator test was off load 14.62v and on load 13.45v somthings not right