Join Date: Dec 2009
Location: Fort Collins, CO
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Have your charging system tested. It could easily be a combination of things.
The first thing to do is put a digital volt/multimeter across the positive and negative terminals (everyone should own one, so get one if you don't have it) and see what voltage registers...but not while there are jumper cables on it.
I suggest first charging the battery (every garage should have a betery charger, too...) and then doing the voltage check. If the voltage while running is less than 14V, your alternator almost certainly has problems. The Murano will reduce charging voltage below 14V if the battery is at full charge, but even if the battery was fully charged, after running for a few minutes the alternator should kick in.
It's entirely possible that your battery is the problem. Muranos are very sensitive to failing batteries, and can misbehave in many odd ways if the battery isn't taking or holding a charge.
Only a proper charging system test will tell you what's really going on..but I'd go after the battery first.
2009 BMW 328xi
1983 280ZX Turbo