I have a 2003 Kia spectra. The battery died so I got anew battery. It died again so we got a new alternator. Still would nots start. Jumped it and started fine but would not keep a charge when not connected to the other car. No lights were flashing on the dash. Bought a new battery, put it in. Car started great but now two simultaneous lights were flashing..the brake and battery lights! Could it be a faulty new battery? Or any other suggestions?

CHECK ALTERNATOR FUSE AND FUSE LINK ALTERNATOR NOT GETTING NO POWER FROM BATTERY.ALSO CHECK ALTERNATOR WIRES CONNECTORS FOR DAMAGE OR BROKE WIRES IN THE ALTERNATOR ELECTRICAL CONNECTORS. I HAD SAME PROBLEM WITH CHEVROLET THE VOLTAGE REGULATOR WIRES CAME OUT THE CONNECTOR I HAD TO BUY NEW CONNECTOR CRIMP IT SOLDER THEN SEAL IT WITH ELECTRICAL TAPE IF FUSE AND FUSE LINK OKAY MORE LIKELY YOU HAVE DAMAGED WIRES AT CONNECTOR MAKE SURE DRIVE BELT TIGHT AND NOT SLIPPING.