my van will crank fine but will not start. the battery has 12.4 volts when not running. I cleaned the terminals. The only way it will start is if I hook up the battery charger and set it to 200 amps on high. then it fires right up and keeps running even after charger is removed. once running the battery charges at 14v . I even tried a new battery and it still wouldnt start unless jumped with the charger.