Nope doesn't matter (polarity - its just a coil of wire).
You gone and shorted rectified mains to earth. Oops. Test the base drive resistors, they end up as fuses on these as well. If your transistor isn't shorted (would have taken out the fuse as well) then you may have wrecked more semiconductor havoc in the bridge rectifier, or turned something else into a fuse
New evil decided - GNG offroad build on Craftworks DHR with 12S4P lipo. Aim - Light, balanced, powerful, able to climb a tree.
Project Vectrix restarted. Status - BMS + Charge control redesign (read faffing with batteries again)