Wife was sitting at a long red light when the car stalled. It restarted, but died almost immediately.

ALL electricals are dead. There's no power to anything. No ignition, clock, hazard lights, dash lights, power locks, windows, etc. It's as if there's suddenly no battery in the car.

----EDIT-----

Fixed!

Semi-corroded on the + clamp. Rather the clamp was not super tight. Once I removed, cleaned and replaced, it's all back to normal.

Still not sure why it died abruptly at a light, but it's good now.