Si I’m pretty stumped,?i just watched the videos you posted if it turning over with no plugs and not turning over with the plugs in. That really does sound like a bad battery, it you have a brand new one. As I mentioned, I don’t have much experience so hopefully mikidymac or poops will have advice but I would double check the voltage of the battery when under load, I’m not sure What the volts should be when cranking but it seems to me that somewhere you just don’t have the juice to crank it over when plugs are in. To me it sounded healthy when you were cranking with plugs out. I’m only guessing, not really sure, i would have to do research myself but maybe it’s the voltage regulator/rectifier? I’m off today so I will do a little research and see if I find anything. I don’t know about the bendix either, does it still crank over nicely with plugs out? If it does then I would say you are fine there. Also wanted to ask what you meant by “ the lines are off” do you have the oil lines off?