Key on Engine off, Alternator hum

[tjb]

Hi All,

I have an 89 stock Vette. It is my first one and I've had it for 1 year now. I bought a scantool recently and after I finished seeing how it worked the Batt. light was on. I started it up and it was not charging. I had to be somewhere fast so I went to NAPA got one and threw it in. It worked fine. The next day I noticed a loud hum with the key on and the engine off. I was making sure it was the alt. with a screwdriver. The screwdriver stuck to the front cooling fins on the alt. Is there anything I should check or should I just return the alt?
Could the scantool in any way have caused this. It is an Actron 9150. I used it in the field service mode to clear some SRS codes.

Thank you
Terry

 

[C4Tom]

Call NAPA and ask them about the hum. I wouldn't mention the scantool to them, it may void the warranty. I can't see any reason for the scantool to affect the alternator. More like a weak triac in the alt.