Battery not charging but light goes out

[Andy ainsworth]

Hi everyone.

Am a new one and my first xj 2.7 2009

Bought the car and on the way home the battery went flat. I just bought a new battery and charged it up. Was reading 13.2 volts engine started and battery light went out. Then I turned every thing on about 5 mins later and left it ticking over. Checked the voltage and the battery was draining. Would seam the alternator is not working? I checked the 10amp number 30 fuse in the boot and that's ok. Left it over a few nights and the battery is down slightly 12.3v

What is the next check I need to do before fitting a new alternator? Is fitting one an easy job?

Thanks in advance

Andy

[Jimbov8]

What voltage do you have at the battery terminals with the engine running?

[Andy ainsworth]

Thanks for your reply.

First time it was so low the radio went off and the warming message come for loads of stuff.

 So it runs really low. 

Second was a full battery and I loaded it with everything turned on kept running till I turned it off at 12.7

 

Thanks for your help