Jumper start with another car.. your car will start and run but if the alternator is defective it will not charge your bad battery and your car will not run on the jumped ae removed.If this is so don't drive the car.altrnator is defective. 2.If alternator is o.kthe car continues to run even I the jumper cables are removed as the good alternator is energizing the ignition coil and the engine continues to run.Therefore drive to the nearest garage to replace the defective battery..This what happened to Honda Civic Skanda6. We jumper started this car drove to mechanic I Markham to fit a new battery.