Alternator/Battery problem?

Hi, 

Ive tried googling the answer and searching for youtube videos but im still unsure…

Ive had a Charge and a Heater light on and off for the last few weeks, it has been running and starting fine with no problems until yesterday.

I tried the LED diagnostics check with the lights on and off with no faults showing and then the battery/alternator problem started.

After giving it a quick jump start with another car ive turned the car off and tested the readings at the battery… 

The battery was sitting at 12.4v with the car off.

13.96v with engine running

13.3v with lights, heater and radio running

13.9v when all the above turned off again and engine still running

12.8v when engine turned off which drops down to 12.6 or less pretty quickly.

i dont know what to make of all that information but if anyone could help it would be great!

Normal charging rate is 14.7 or 14.4 mininum as far as I know.Someone on here will know more details

Definitely think it’s the alternator, took it for a long drive there and the charging rate was lower than even earlier on… hoping it’s just a dodgy connection… hard to see anything though :frowning:

I’d like to see upwards of 14 volts when charging TBH.

Great… best deal on an alternator anyone? Lol
what should I expect to pay to get one fitted?

If its at say 12.6v now and tomorrow morning it’s dropped and won’t charge I’m guessing the battery is stuffed to?