Quote:
Originally Posted by 18lstroup
In My 2008 335xi coupe all my lights flicker. Interior and exterior. Battery and alternator are good ... Where are the ground locations? I found the one by the battery and the two on the strut towers where are the others?
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As ewicky suggests, if ALL lights flicker, interior & exterior, when the vehicle is stationary with motor running, but NOT when engine is OFF, then you probably have an issue with alternator voltage output, either due to a Voltage Regulator fault, or a loose connection in the Alternator/Battery circuit.
First diagnostic step I would suggest (after testing engine on/off as described above) is to activate "Hidden Menu 9.00" as described in link below to display system voltage on your instrument cluster, and watch for voltage fluctuation as motor runs. Of course you can also read System Voltage parameter on a scan tool connected to the OBD II socket, or connect a voltmeter to the lighter socket. An old analog voltmeter might show rapid fluctuation better than a digital device:
http://e90.wikifoundry.com/page/BC+hidden+menus
Vary RPM while stationary in Park, and see what happens. Check ALL 12V+ Battery Connections and Chassis ground Negative Battery Terminal per this TIS circuit diagram for your Voltage Supply System:
https://www.newtis.info/tisv2/a/en/e...or-ibs/aeTiAe0
Please let us know what you find,
George