Alternator mystery

[Fred]

When I start the car the alt light comes on until I rev the engine pretty good(3000 RPM) and then it goes out. After running for a while it comes back on and only dims a little when revved. Could this be because I have a new battery and it doesnt need to charge or do y'all think there's a problem? when I disconnect the Positive terminal on the battery the car dies, All these Parts are new, any ideas?

[jspbtown]

I would check your connections and belt tension.

You say a new battery.....I assume the old one died? Whats the voltage read when the light comes on? You can check it with a voltmeter. Your alternator could be on its last legs.

[Ken]

when I disconnect the Positive terminal on the battery the car dies, All these Parts are new, any ideas?

It could be a connection, but it sounds like the alternator is not functioning properly. I would pull it and have it tested. If the system is connected properly (it was not doing this before?) you simple test is a pretty sure indicator of a bad alternator. Your battery is likely providing all of your electrical needs and is not being recharged. Starting problem are sure to follow...

[Don]

I would check your connections and belt tension.

Definitely check belt tension and condition. Might want to pull your alternator pulley and make sure there is a woodruff key.

[Fred]

Its amazing how something so out in front(Rear) and accessable can be such a pain in the a#% to remove!! The alternator is under warranty so I just pulled it and will replace it tomorrow. Thanks for all the help, Fred.