Brake warning light ?

[lutronjim]

I just had to put a new cylinder and switch in my 70 ss. When I go to crank on switch, the brake warning light comes on - didn't with old switch. I assumed this is like a bulb check.

I thought the proportioning value grounded one side of the bulb turning on the light with 12+ on the other side coming from the switch when the front or rear braked lost pressure.

How is the bulb coming on when switch is in the crank position? I couldn't test switch as I had to drill cylinder down past the 'pegs' because the key wouldn't turn left and when i removed switch it blew apart.

I am also seeing oil pressure light when I turn switch to accessory position - old switch wouldn't turn there. I thought accessory would just power things like radio.

Thanks