[PegasusJockey]

I think I have an explanation for why it would not start with a jumper. I admit that part of this is guessing though. I think we will all agree that electronics can be finicky about having the correct voltage. Solenoids and starters not so much. When you hook up a jumper to a very dead battery you are appling approximately 12.8 volts to charge the dead battery. You have plenty of amps to turn the motor over BUT your battery is still charging. In doing so it is using the voltage and amps to restore itself thus I would guess if you put a meter on the output it might only show 11 volts or so even if the starter is turning. That is way less voltage than the electronics requires. Under such a condition I am sure that even attenpting to push start would be unsuccessful.

 

[PegasusJockey]

Oh, forgot to add that if you had just let the battery charge for 5 minutes with the jumper I think it would have started up just fine.