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What voltage are you measuring at your alternator? Between what and which?
The voltage at the B+ terminal (that's the big wire that feeds the power back into your battery; it may go to the starter first?) should be the same as the voltage across the battery terminals, to a large degree. An 8V difference either means that you are measuring something else, or that you have a huge amount of resistance in the charging circuit from the alternator through the battery and back to the alternator.
-soD
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