I have had probs with charging , driving , voltage drops to apox 8 volts on gage , pull over restart , voltage up to apox 14 on gage . Drive for apox 5 miles voltage drops right off and check gages light on . Make it to my shop . Test alt , replace votage as normal . 5 days of driving good , on start up , inlet heater cycling , lights dim , voltage shows about 10 on dash , but gage not cycleing as normal ( up then down )check at batterys volt show 14.5 apox . In about 2-3 mins . It comes up on dash gage . Hv load tested bats , cleaned posts , also had tipm replaced . Still same . Any were i shd look

Yes i understand , but usualy it will cycle down to ten then come up to 14 or so . Then repeats this multiple times . Then stays at 14 . It only comes up to 14 after about 2 . 3 minutes . That is not normal .

No grid heater is doing its regular cycle , on off on off . But gage on dash stays around 12 volts . Then 2 minutes latter gage on dash goes to 14.4 . After grid heaters hv stopped .