The problem - overcharging of the battery

Autoelectro, the UK’s largest independent remanufacturer of starter motors and alternators, has highlighted the solution to an issue relating to a specific BMW that is causing the failure of the alternator regulator.

The problem – overcharging of the battery – exists on the BMW E60/E61 530d MY (2004-2005). As the battery reaches its optimum charge, the ECU attempts to shut down the alternator, but it cannot, as the part is unable to communicate with the failed regulator and the system overcharges.

Additionally, it is causing complications with the wiper system, with wiper blades only wiping occasionally despite being placed on a constant setting.

The failure is highlighted by an intermittent battery warning light flashing on the vehicle’s dashboard.

Autoelectro, with more than 30 years’ experience in the rotating electrics sector, recommends that technicians should carry out the following steps after examination: 

  • Disconnect and remove the battery
  • Leave the vehicle overnight to reset the ECU
  • Replace the alternator with Autoelectro part number AEK2319
  • Install and connect a fully-charged battery

Failure to follow this procedure will result in the premature breakdown of the alternator after replacement.

Technical information continues to grow

The latest bulletin from Autoelectro is one of more than 500 articles available on the company’s website – www.autoelectro.co.uk – which provides free advice to technicians. 

They can register now to access a library of information, as well as receive the latest bulletins via e-mail, ensuring they can ‘fit and forget’, as it states indelibly on Autoelectro’s bright red packaging.