I have a 2016 international Prostar. Voltage was going over 18v. Shop replaced alternator. Since than I've been having issues with low voltage now. Been in and outta shop last 3 weeks and no one can seem to find the issue but have replaced starter, batteries, connections, ext.
I have seen on a forum here that someone mentioned in the internationals there are 2 alternators used (200amp and 300amp) is this true?
Right now when driving it will go from 14.5 and down to lower than 10v. Will shut off as much electrical (radio, GPS, ext) and throw codes. I pull over put brakes on and high idle for few mins and will power back up. This will continue to happen. Sometimes every 5 mins sometimes will go 2hrs but then happen again.
Electrical is a real.#### and looking for any help please and thank you.