car battery

 

A car battery can run down for any of several reasons:

  • You accidentally left the lights on or some other accessory that pulls power from the battery even when the ignition key is off.
  • The battery is not being recharged while the vehicle is being driven (you have a charging problem)
  • There is a key off parasitic electrical drain on the battery because a relay is sticking, a module is not shutting down, or there is a shorted diode in the alternator.
  • Your battery is old and will not hold a charge anymore. The battery needs to be replaced.

 

 

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