Thanks , good info there , need to take it a run to see if iv fixed it , strange hing is all voltages seemed great last night , but didnt take it a run , just sat idling for 15 mins , this morning i went out and battery had went from 12.7 volts at night with no engine running , to 11.4 volts and obviously couldnt start car what would cause this ? ive got a ugly night rider type alarm light that ws on the car whem i bought it , basically is a red light that moves form left to right constantly , could this run my batt down just a idea