Alternator problem?

[ahhjaws]

Hey, I just had my alternator replaced about a month ago, but the past few days the battery gauge has been jumping around from 12V and above when the car is on. It only happens around 5 mins after I start it. It starts fine though, and it doesn't jump lower than 12V.

Anyone have any thoughts?

 

[mrboyle]

Sounds like there is a problem with the regulator in the new alternator.