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Old 08-31-2019, 01:39 PM
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Location: Northeast Indiana
 
Join Date: Aug 2008
Posts: 11,505
Mein Auto: 2006 X5 4.4/2013 650ix GC
Here's a relatively easy thing to do...how about unlocking your instrument cluster to see what the battery voltage is...especially during the times that it won't start.

If you are unfamiliar with unlocking the cluster...there are multiple videos on YouTube (for the various generation of BMW instrument clusters) that shows how. Find a video that has the type of cluster you have...all the generational cousins of your model/model year (e70/e60/e65/e63/e90/etc) will have the same instructions and procedures for unlocking the cluster...so any of their videos will work for you.
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2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 2013 F06 650ix Gran Coupe` (Black Sapphire) 1/13 mfg date
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