[HyperMileQC]

The "Phases" you are talking about is the switch held on (Phase-I) and the switch relased after engine cutoff (Phase-II) ? If this kill the engine like when you key EOC, then you could really bump start like I do. Not with the electric motor.

About the DC-DC...

If the signal is normal the DC-DC converter default condition is alternator like mode. Then if you cut that signal with a switch. The DC-DC converter will stop working in alternator like mode until you return to OEM signal, right?

Then what doesn't work? What I was thinking about is a way to decide if the DC-DC converter works in whatever condition it wants or is OFF. I was not talking about the DC-DC enable thing. Why would I want to charge my 12v battery even during OEC when what I want to do is make the DC-DC converter work less often. You could compare this idea to an "alternator ON/OFF switch" on conventional cars.

90% of my mileage is short trips. So I could let the DC-DC converter off all the way and charge my 12v battery at home without problem. I want to save the 144v juice for assist and also to charge less often.