Question about 1998 BMW M3

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Runs fine for a wile then dies battery drained

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Hi
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.
Most of the time if the battery is fairly new and keeps getting drained have the mechanic check the alternator if its charing the battery.
Thanks for using Fixya.

Posted on Mar 14, 2011

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