[DWH52]

The dreaded "Electrical System Service Required" appeared and left us sitting at the side of the A3 waiting for the very nice repair man.
After an entertaining couple of hours playing I-Spy he arrived and diagnosed a blown alternator. Not being able to source a replacement he loaded us up and brought us home.

I've got the old alternator off and now trying to source a replacement.
What's got me confused is the one I've removed is 120AH and all the ones I've seen advertised are 140 or 160AH.

Will fitting one of these cause any problems I'm not aware of?