P0A0D to no end…

I'd like to help, but I'm having a hard to following. Beside, imo Chat and TRM are the two best Gen 3 techs on this forum at this time. And there is no way I could offer any better help than they are giving you. In case it was missed (I know how hard getting a pack rebuild sussed out the first time around ) there was also a EGR cleaning while doing the pack reconditioning. (imo that's way overkill on the possiblity scales). my advice is to stick with one of the the other Chap or TWM suggestions and try to give as through a go at digging out answers for them. I said my piece, I"m out, and no real need to comment back as I'm pretty lost as it is.
And don't be to afraid to ask them how to do, if you don't understand what they are asking you to test or look at. This stuff in pretty complex.

 

If all you did was use the safety interlock switch as a 'switch', the odds of causing any significant damage are very slim. It probably created a very small arc as the plug and socket made contact with each other, but the amperage is so low it's no big deal. It's just not a preferred practice to complete an electrical circuit because it's not really designed to be used that way. Lightbulbs aren't exactly designed for that either, but who cares about any arc damage on them..