The Cummins doesn't need the intake air heat to start unless it's below -20 or so.
Bypass saves the battery supply and could help prevent the truck from going into battery saver mode, more likely to occur on trucks without dual alternators.
The grid heater is going to cycle anyway once started.
Bypass saves the battery supply and could help prevent the truck from going into battery saver mode, more likely to occur on trucks without dual alternators.
The grid heater is going to cycle anyway once started.