Bump for more befor I go and spend my money on a new alternator

 

Also S2000 have small stock batteries so if you have any extras hooked up to it like a sound system or a/c-d/c converter or any other electronics that are powered by your car they could be sucking up the power or destroying your alternator

 

I have no other electronics or sound system connected

 

roi, remove the ground bolt, claen it up and reinstall it. That may be be just enough to fix it. Also there is more that one ground under the dash. check them all.

 

Thanks, I will check them

 

I have not replaced the alternator. It's only two years old. The only other electronic device I have is a radar detector.