Does anyone know what charging failure means on a 2005 BMW 645Ci? It comes on intermittently. WIndows will then work slow, dash lights dim. Eventually it goes away and everthing works fine.
I would check all the battery connections first. These connections need to be absolutely clean, free from corrosion and tight. A 645CI will be expensive to diagnose and repair.
Checked and battery is clean, cables are tight.
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