I may be getting older, but I refuse to grow up!
Trickle/float charge your battery to around 13.5 volts for a few days. Even a new battery should be charged.Also it’s throwing code 13 and 46. Going to keep checking wires and continuity...
Try with the speed controller unplugged. You never know, it could be shorted.
I don't have my book handy, what are codes #13 and #46?