What Does This Mean ? Battery Light Flashing On Instrument Cluster Of 2000 BMW E39 M5?
My M5 battery indicator/icon on the instrument cluster starts coming on and off while driving on the road. It is not a loose cable cause I check the cable, I suspect that it may be the battery, voltage regulator, or an alternator. It could be that the computer is throwing some false codes.
Please let me know if you are familiar with this. Thanks
The battery light on the E39 M5 basically indicates a electrical under/over-voltage being reported to the instrument cluster. The first, and most basic thing to do is check the longer, right-side drive-belt on your engine. If it is loose, then it may just be slipping on the alternator causing an intermittent interruption. The belts on the S62 engine you have can be adjusted rather easily. The battery could also be the culprit. BMW batteries typically last anywhere from 4-6 years. If you have a BMW battery, check the negative terminal and a production date will be stamped on top in week and year. (Ex. 52-99 would be the second week in December, 1999) Depending on production date, the M5 uses a water cooled alternator that has a typical lifespan of about 65-95K miles. If you are within that range, your alternator most likely is starting to fail. There are no user-serviceable parts on the water cooled alternator, so your only option is replacement.
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