I'm not Jack, but yeah that sounds right. It is called a 12volt system, because the battery is 12 volts, but the charging system usually puts out mid 13s, which is right where you are.
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Brian
Keep it shiny side up, but show them your dirty side once in a while.
11.3@123mph on 195/75/14" whitewalls. Yes, 195s!
11.2 on the big giant slicks. What's the point? Maybe I'll go back to the whitewalls. They are lighter and have less rolling resistance.
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