Re: Electrical gremlins
Disconnecting the battery while the alternator is turning is a big no no. The alternator will start to generate voltage spikes upwards of 100V and as you discovered it won't turn off the engine anyway because the alternator will keep it alive. That said most modern electronics have protection built in to prevent damage in case this happens so hopefully you did no harm. But even that protection is limited so be careful.
I would look at the ignition switch next as others have stated it may not be working and letting the voltage get through to the ignition wire. With key off probe the ignition switch connector, the red wire is hot, brown wire is ACC, pink is IGN, purple goes to the starter solenoid, and green is ground. The only wire that should have a voltage with key off is the red one. I suspect you will find that the pink and/or brown wire are hot when they should not be. If so then disconnect the connector and probe again.
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