Originally Posted by SUPER_SPORT
Car crapped out with a dead battery. I can charge the battery with a shop charger but how do I know if the alternator is bad. What is the best way to check the alternator for a '98 328i?
You can attach a voltmeter to your battery with the car running......
you should have 13.5 to about 14.5 volts engine running & nothing turned on & a little over 12 volts with everything turned on.......
Things you can do, remove your battery & fully charge it, then bring it to a Pep Boys or Advanced Auto parts store & have it load tested, if it checks ok!
and you still have a low voltage issue then the alternator is bad.....