The part I am having trouble with is why the battery which should be at ~ 12.4- 12.6 won't keep the car running, but will start it powering both the starter and ignition, during which time the static V will drop to 11 or so volts due to the amps drawn by the starter.
I am not disagreeing or wanting to start an peeing contest but rather understand how low alternator output at idle makes the motor die but start right back up with less available V and I from the battery than was available when it died
Ballast resistor is bypassed in start so you will have more voltage to the ECU in start than in run.
In a normally working system you have about 9v to the ECU in run, when the ballast resistor is bypassed you get full battery voltage, even if it battery voltage drops to 11v in start that is more than the ECU gets in run.
