You have crossed up direct power (like, say, brake lites) that does NOT go through the ignition switch with coil feed.
IF you re-connect the battery, you will most likely find battery power at the coil (power in side).
Possibly melted wires, but most likely you've mis-plugged something.
That said, it could be two different things entirely.
You could have wires crossed up on ignition switch, ignition switch may have fallen apart internally and not moving with key, and the brake lites issue could be totally unrelated.
But, to give you an idea:
On my MK2 Jag, the brake lite switch is on the inner right wing, right next to the distributor.
I can see crossing wires up on this.
Now, stop and think.
Since your last dealing with the dieseling issue, what have you done?
What did you take apart?
What did you move or replace?
If you can remember, the last thing you did is probably what has caused this issue, or at least part of it.
Dave