I didn't bypass the kill switch when I threw in a battery from another car in the garage. I'll give that a try tomorrow thanks.
See this is why I hate wiring/electrics. Nothing is straight forward. At least with the last big mechanical issue I had, it was easy to diagnose.
(The fact that it was seeing half a piston and a pin bouncing down the road, a smashed rod hanging out of the
oil pan which had been split in half by the carnage and destruction made it particularly easy to diagnose why it stopped running
)