i have a 2007 entourage, had battery replaced and noticed lights dim upon decel on 2007 Hyundai Entourage

mainly below 30mph and only momentarily. any suggestions?

Asked by for the 2007 Hyundai Entourage
Make sure the battery terminals are clean and tight. If you have a voltmeter, check the alternator output. Voltage at the battery should be 12.6 with engine off and at least 1 volt higher with engine running. If those check out to your satisfaction then you will need access to some diagnostic equipment to check alternator amperage output.