High Voltage Reading on Dash Guage
Have a 2001 Yukon XL. Couple of months ago, voltage meter started bouncing between 12 and 14 volts when sitting idle. Original alternator in vehicle, so it was replaced. After a couple of months of replacing alternator, the battery symbol light up on message center and dash volt meter was ramping from 14 volts to 17-18 volts. Cut car off and restarted. Problem went away for a while. Started happening more frequent and thought there was a bad voltage regulator in the new alternator. So replaced alternator again. Couple of months later, high voltage reading starts up again. What is causing this high voltage to occur?