Hi everybody. Since a few days, when I start my '90 Esprit SE from COLD, my battery/alternator light stays on for about a minute and a half, then it suddenly goes out. When I start driving immediatly, the light goes out a bit faster than when I just leave my car running alone. I don't have any starting problems, but it is most noticable when my headlights are on, because the moment the battery/alternator light goes out in my dash, my headlamps become much brighter!!! What can I check/fix? Thanks.