i have a 97 coupe with a h2b swap. obd0 d series alternator. new 6g power wire to fusebox. new advance auto parts alternator, new battery, new belt. my battery light turns on at high rpms and my lights go dim. what could the problem be?

 

clean off all grounds. If you are using something like an innovative alternator relocator scrape it where it meets block. Ive seen grounding issues with those.