I drive a 2007 A4 B7.

Found a A4 B7 2005 model at a local pull a part and I intend to get the alternator off of it. I need to know what size the 4 bolts are on it so I can bring the right tools with me.

Idk if my alternator is bad, the auto zone guy said that's what he thought but he wasn't sure. The battery was at 12V running, 10V off and 8V under load test. I had driven it through traffic for ~1hr before arriving at the auto-zone. Had to roll start it the previous 3 cranks.

If the junkyard alternator is good it will be MUCH cheaper than replacing the battery (will need to at some point anyways, it is ~5yr old). Junkyard alt <$50 new batt ~$200.

 

Not sure the bolt size. Is the car not starting but stays running after a roll start or jump? If so then the alternator is probably fine and the battery is the issue.