hi ive got a transit 54 reg diesel duratorqe the fan belt went on it well one of the alignment rooler wheels seized up actually which made the belt go now ive put anew belt and wheel on but when runing battery light stays on ? ive put a volt meter on battery and it reeds 12.7 volts not runing and 14.7 volts when on tick over so seems to be charging ok ? so why is battery light staying on ?