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My car is having some weird fluctuations in the voltage. I recently got a heads up display that shows the constant system voltage and it's raised concerns.
Most times when I'm driving the voltage will not go higher than 11.8v when accelerating or cruising but when I coast it shoots up to 14-14.2v then back to 11.8v when I come to a stop or idle. Then 1 or 2 days out of the week the voltage will sit at 14-14.2v even when accelerating or idling. What could be going on? Is it alternator? Battery?(only a year old battery) Battery management?
 
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