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Old 12-16-2012, 07:16 PM   #5
CoryM
 
Drives: 2009 5-door, 5-speed
Join Date: Sep 2011
Location: White Rock BC
Posts: 687
Chicken or the egg?
A bad battery can draw down on the alternator keeping it from producing full voltage. Charge the battery (or temporarily replace with a known good one) and check your voltage again. Either way you want to have the battery charged because if you replace the alternator, the new one will overwork itself trying to charge the low battery. It is only meant to top-up the battery, not fully charge it. I would guess it is the battery in this case but hard to tell from several thousand km away ;)

Cheers.
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