'nuther stop light question

Alright, I have brake lights some of the time but only when the car is running. Key off, I have power up to the switch. Tail lights, hazards and turn signals all work. Fuses are good, replaced a few 'just in case' there was unseen corrosion but everything there is hunky dory.

I have a new TS switch on hand but everything else that goes through that harness seems to work, plus the brake lights work some of the time.

Anyone have any ideas? Should the brake lights work without the ignition on or am I wrong?

Thanks,

- Greg