Fully recharge the battery with a charger. Obtain a meter and measure its voltage, should be 12.6-.8 volts about. Then start your car and measure battery voltage. 14 volts or higher will be present if the charging system is good. If you have less than 12.6 volts, it is not charging, but discharging. Then you should check wiring or alternator. I remember reading the megafuse can cause no charge condition.
