I got a 2013 freightliner Cascadia dd13.im trying to get find out the avg voltage on truck. I’m scared because my battery light came on 2 days ago and it was because a small wire on the alternator broke off. I fixed it. When I’m driving it’s showing on dash 13.1 to 13.4 when parked up running 13.4-13.5 is the readings when driving are low or it’s normal ?
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