Hello, I have a problem with my Stilo 1.6. Thing is, it wont charge battery upon starting angine, on idle, no charge. If I rev it past 2500rpm, charging starts, then it is charging on idle just fine. After charging begun, it will maintain constant voltage across entire rev range. Swaped alternator, same thing. Can someone tell me what can be the problem. Where the wire for alternator field is connected? ECU?