![]() ![]() If after charging the bad vehicle and using the good vehicles battery to jump start the bad vehicle, and it starts then the battery was just discharged, and may still be good. If after charging the bad vehicles battery and disconnecting the jumper cables the head lights will still not come on then the bad vehicle has a totally dead battery as in time to buy a new battery. You can do one more test to confirm that the bad vehicles battery is totally dead. If after charging, the bad vehicle will still not jump start then the bad vehicle has a totally dead battery and it is time to purchase a new battery. Then stop the engine on the good vehicle and with the good vehicle still connected with the jumper cables try to start the bad vehicle.Īlways turn off the engine on the good vehicle while jump starting a bad vehicle to avoid any chance of damaging the alternator on the good vehicle. Turn off all accessories (radio, lights, interior lights (doors closed) ) on the good vehicle while charging the bad vehicle. If you do not have a battery charger you can still charge the battery by connecting the jumper cables from a good vehicle to the bad battery and running the good vehicle for fifteen minutes. If the battery is dead because someone left a light on such as an interior light or a head light then you need to charge the dead battery before you will be able to jump start it. Usually you can NOT jump start a totally discharged or completely (totally) dead battery.
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