91 CRX with ZC motor. I just replaced the original alternator on my car because it couldn't keep voltage (it went all the way down to 7.5v at some points). After replacing the alternator, I get the battery light when I pass 4500 rpm. I checked the voltage and at idle it runs 14.20v and the point that turns the dash light on it is running at 16v. I am used to this car running at 13.50v at idle. The alternator came with a note that said Honda approved a smaller pulley than the OEM because some drivers were complaining of low idle voltage. I didn't notice a difference in pulley size when I was trading them out, but I wasn't looking for it. A few questions, Could the pulley size be causing the higher voltage than the old alternator did? Could I have tightened the belt too tight and make it run higher? Any other ideas?