Battery lights up at higher rpms?

[Kewowskata]

I tried searching and couldn't find. Soooo, the past couple months my battery light has been coming on when it's at around 4 or more rpms. I went to autozone and got it tested and everything seemed to be just fine. A weird thing was, I changed my plugs and wires and for awhile my battery light would stay on the whole time until I hit around 4 rpms!!! What the?? I'm confused. That went away after a couple days and now it's back to what is was doing before. I have no idea how this stuff works, any help would be greatly appreciated. Want to catch the problem before it could get worse.

 

[jaydez]

When mine did that it ended up being a bad alternator. Eventualy you will start noticing it at any RPM over 3000. Did Autozone load test the alternator?

 

[Kewowskata]

Yea they tested the alternator, battery, and something else I forgot.

 

[Sedition]

My money is on the alternator. If it were my truck I would change it before too much AC (alternating current) leaks accross its diodes and begins to fry your electrical systems.

 

[Dalmus]

Ditto on the alternator. I had similar symptoms and waited too long... The Alternator ended up taking out a cell on my battery and had to replace THAT as well as the alternator.

 

[Kewowskata]

Cool, thanks guys! Will do this A.S.A.P. might as well upgrade the wiring while I'm at it also.