Ont. and NFLD. I don't really look at peoples cars though any more. I have a backlog of cars I built that I have not had time to look at.Where are you located?
So unplug the 4 sensors and you can plug them into each other to keep things tidy and not hanging down.
12.3V and the car started? Is it going to sleep? Check right after a drive and then the next morning or even a few hours later then again a few more. Just to establish a rate of decline. Then one time after a drive disconnect the neg term so the battery is disconnected and see what the volts are the next morning. It might not be the battery it could be a rodent made short some where in the car drawing some power. Depending where the short is that could explain a lot. It also does not have to be a short to ground it can be one positive wire shorted to another positive wire. That can make things power that should not be powered. I would keep looking for rodent nests or droppings.They seem to love it in the dash but also under the plenum, lots of places have been reported