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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 09-21-2012, 11:43 AM   #1
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Join Date: Sep 2012
Location: Baltimore
Posts: 2
My Ride: 2002 325i
2002 325i Alternator Issue

I've read through some other posts here on alternator issues, and I've received a lot of great info, but I'm having one variant to a possible alternator issue I hope someone can help me with:

Started car this morning and the alternator charge warning lamp came on. It stayed on for a minute or so and then went off. I drove about 4 blocks and when coming to a stop sign, the car died. It started right back up and I had no more problems with stalling (drove a few miles and came home).

Ran diagnostics for both battery and alternator charge and battery was showing 12v with key 'On', and when I started the car, I saw no movement from 12v to the 14v I expected.

A couple of hours later, I ran the diagnostics again, and when I started the car, this time, it jumped up to the 14v, and seemed to be running fine.

I don't think this is an alternator issue, but more of a voltage regulator issue. Would like to know if anyone else has ever experienced this kind of system charge inconsistency.

Forgot to mention the battery is brand new.
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Old 09-30-2012, 11:35 PM   #2
Beamer Creamer
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Join Date: Sep 2012
Location: Canada
Posts: 270
My Ride: 2005 bmw m3
Why was your battery changed?
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