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2009 LS460 Alternator problem?


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Usually my self installed volt meter shows the car running at 14.3 Volts all the time.  However, yesterday I noticed it showing 12.5 volts. A short while later, it went back to 14.9 Volts for a short time. Then went back to 12.6/12.5.  Did this a few times.   I haven't been out today yet. I assume it's a faulty alternator, but no CEL or anything showing on dash. Drive belt appears to be correct tension. 

If it is faulty, how big a job is it to replace? Looks as if it wouldn't be the easiest of access.  Plus I'd have to find an alternator.

Any comments would be appreciated, thanks.

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