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From my experience, when the dash lights illuminate erratically on the Z4 (or at least the M), it's an indication of an over- or under-voltage situation. I've replaced the battery and cabling, and had a shop go through everything except the alternator. The situation doesn't happen all the time, so I'm suspecting it's the voltage regulator. I'm open for other thoughts, as I hadn't encountered significant electrical problems until now.
I'm also interested to hear who has replaced a voltage regulator, only to come back a short time later to do the whole alternator. The car has 115k miles, and I'm wondering about the life expectancy of the rest of the components, and trying to do a risk analysis of only doing the voltage regulator.
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