Need some help. Alternator went the other day got it fixed but still having a problem with charging. Charged up the battery today and at idle the battery will drop to 10 or 11 volts. If I take out the fuse for the head lights it will go up to 13.5. The battery is less than a year old its a 2000 gl1500 and its a compufire alternator and a ATM battery.