Oil Light on--only when not running

[Ken M.]

I've got a 1975 TR6 with an interesting problem.  The car runs fine.  However, when I turn off the car, and remove the key, the oil light comes on and stays on.  The only way to turn it off is to disconnect the battery terminal.

I see on the wiring diagram that there is a connection between the oil light and the brake fail switch, but I'm not sure what that means either.

Any ideas?

[piman]

Hello Ken,

the dual circuit brake balance warning light is in series with the oil pressure switch and should be supplied with a white wire from the ignition switch and should be dead with the ignition off.
This is used as a lamp check for the brake warning every time you start the car.

It sounds as if that circuit is wrongly fed, have a look at the brake balance switch to see what wires you have there? What you don't want is a purple wire as that is permanently live?

Alec