I have a 91 Integra GS. My alternator went out, so I replaced it (w/ a used one). Now, my charging light goes on while at an idle, but goes off if I give it a little gas, and while im driving. Sometimes, it stays off while at an idle, but usually it lights yup. Could it be an incorrectly tensioned drivebelt? It must be charging while im driving, or my car would have died by now, right?